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"select * into table" Will it work for inserting data into existing table

- by Shantanu Gupta

I am trying to insert data from one of my existing table into another existing table. Is it possible to insert data into any existing table using select * into query. I think it can be done using union but in that case i need to record all data of my existing table into temporary table, then drop that table and finally than apply union to insert all records into same table eg. select * into #tblExisting from tblExisting drop table tblExisting select * into tblExisting from #tblExisting union tblActualData Here tblExisting is the table where I actually want to store all data tblActualData is the table from where data is to be appended to tblExisting. Is it right method. Do we have some other alternative ?

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MySQL ALTER TABLE on very large table - is it safe to run it?

- by Timothy Mifsud

I have a MySQL database with one particular MyISAM table of above 4 million rows. I update this table about once a week with about 2000 new rows. After updating, I then perform the following statement: ALTER TABLE x ORDER BY PK DESC i.e. I order the table in question by the primary key field in descending order. This has not given me any problems on my development machine (Windows with 3GB memory), but, even though 3 times I have tried it successfully on the production Linux server (with 512MB RAM - and achieving the resulted sorted table in about 6 minutes each time), the last time I tried it I had to stop the query after about 30 minutes and rebuild the database from a backup. I have started to wonder whether a 512MB server can cope with that statement (on such a large table) as I have read that a temporary table is created to perform the ALTER TABLE command?! And, if it can be safely run, what should be the expected time for the alteration of the table? Thanks in advance, Tim

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How to obtain a random sub-datatable from another data table

- by developerit

Introduction In this article, I’ll show how to get a random subset of data from a DataTable. This is useful when you already have queries that are filtered correctly but returns all the rows. Analysis I came across this situation when I wanted to display a random tag cloud. I already had the query to get the keywords ordered by number of clicks and I wanted to created a tag cloud. Tags that are the most popular should have more chance to get picked and should be displayed larger than less popular ones. Implementation In this code snippet, there is everything you need. ' Min size, in pixel for the tag Private Const MIN_FONT_SIZE As Integer = 9 ' Max size, in pixel for the tag Private Const MAX_FONT_SIZE As Integer = 14 ' Basic function that retreives Tags from a DataBase Public Shared Function GetTags() As MediasTagsDataTable ' Simple call to the TableAdapter, to get the Tags ordered by number of clicks Dim dt As MediasTagsDataTable = taMediasTags.GetDataValide ' If the query returned no result, return an empty DataTable If dt Is Nothing OrElse dt.Rows.Count < 1 Then Return New MediasTagsDataTable End If ' Set the font-size of the group of data ' We are dividing our results into sub set, according to their number of clicks ' Example: 10 results -> [0,2] will get font size 9, [3,5] will get font size 10, [6,8] wil get 11, ... ' This is the number of elements in one group Dim groupLenth As Integer = CType(Math.Floor(dt.Rows.Count / (MAX_FONT_SIZE - MIN_FONT_SIZE)), Integer) ' Counter of elements in the same group Dim counter As Integer = 0 ' Counter of groups Dim groupCounter As Integer = 0 ' Loop througt the list For Each row As MediasTagsRow In dt ' Set the font-size in a custom column row.c_FontSize = MIN_FONT_SIZE + groupCounter ' Increment the counter counter += 1 ' If the group counter is less than the counter If groupLenth <= counter Then ' Start a new group counter = 0 groupCounter += 1 End If Next ' Return the new DataTable with font-size Return dt End Function ' Function that generate the random sub set Public Shared Function GetRandomSampleTags(ByVal KeyCount As Integer) As MediasTagsDataTable ' Get the data Dim dt As MediasTagsDataTable = GetTags() ' Create a new DataTable that will contains the random set Dim rep As MediasTagsDataTable = New MediasTagsDataTable ' Count the number of row in the new DataTable Dim count As Integer = 0 ' Random number generator Dim rand As New Random() While count < KeyCount Randomize() ' Pick a random row Dim r As Integer = rand.Next(0, dt.Rows.Count - 1) Dim tmpRow As MediasTagsRow = dt(r) ' Import it into the new DataTable rep.ImportRow(tmpRow) ' Remove it from the old one, to be sure not to pick it again dt.Rows.RemoveAt(r) ' Increment the counter count += 1 End While ' Return the new sub set Return rep End Function Pro’s This method is good because it doesn’t require much work to get it work fast. It is a good concept when you are working with small tables, let says less than 100 records. Con’s If you have more than 100 records, out of memory exception may occur since we are coping and duplicating rows. I would consider using a stored procedure instead.

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SQL SERVER- IF EXISTS(Select null from table) vs IF EXISTS(Select 1 from table)

- by pinaldave

Few days ago I wrote article about SQL SERVER – Stored Procedure Optimization Tips – Best Practices. I received lots of comments on particular blog article. In fact, almost all the comments are very interesting. If you have not read all the comments, I strongly suggest to read them. Click here to read the comments. The [...]

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Cannot insert explicit value for identity column in table ‘table’ when IDENTITY_INSERT is set to OFF

- by Derek D.

This error occurs when trying to insert into a column containing an identity. An Identity column is not able to be inserted into without the use of a special command mentioned below. Identity columns are columns that automatically increment when a value is inserted into a row. They are commonly used [...]

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Pass table as parameter to SQLCLR TV-UDF

- by Skeolan

We have a third-party DLL that can operate on a DataTable of source information and generate some useful values, and we're trying to hook it up through SQLCLR to be callable as a table-valued UDF in SQL Server 2008. Taking the concept here one step further, I would like to program a CLR Table-Valued Function that operates on a table of source data from the DB. I'm pretty sure I understand what needs to happen on the T-SQL side of things; but, what should the method signature look like in the .NET (C#) code? What would be the parameter datatype for "table data from SQL Server?" e.g. /* Setup */ CREATE TYPE InTableType AS TABLE (LocationName VARCHAR(50), Lat FLOAT, Lon FLOAT) GO CREATE TYPE OutTableType AS TABLE (LocationName VARCHAR(50), NeighborName VARCHAR(50), Distance FLOAT) GO CREATE ASSEMBLY myCLRAssembly FROM 'D:\assemblies\myCLR_UDFs.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS GO CREATE FUNCTION GetDistances(@locations InTableType) RETURNS OutTableType AS EXTERNAL NAME myCLRAssembly.GeoDistance.SQLCLRInitMethod GO /* Execution */ DECLARE @myTable InTableType INSERT INTO @myTable(LocationName, Lat, Lon) VALUES('aaa', -50.0, -20.0) INSERT INTO @myTable(LocationName, Lat, Lon) VALUES('bbb', -20.0, -50.0) SELECT * FROM @myTable DECLARE @myResult OutTableType INSERT INTO @myResult MyCLRTVFunction @myTable --returns a table result calculated using the input The lat/lon - distance thing is a silly example that should of course be better handled entirely in SQL; but I hope it illustrates the general intent of table-in - table-out through a table-valued UDF tied to a SQLCLR assembly. I am not certain this is possible; what would the SQLCLRInitMethod method signature look like in the C#? public class GeoDistance { [SqlFunction(FillRowMethodName = "FillRow")] public static IEnumerable SQLCLRInitMethod(<appropriateType> myInputData) { //... } public static void FillRow(...) { //... } } If it's not possible, I know I can use a "context connection=true" SQL connection within the C# code to have the CLR component query for the necessary data given the relevant keys; but that's sensitive to changes in the DB schema. So I hope to just have SQL bundle up all the source data and pass it to the function. Bonus question - assuming this works at all, would it also work with more than one input table?

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How to fill DataGridView from nested table oracle

- by arkadiusz85

I want to create my type: CREATE TYPE t_read AS OBJECT ( id_worker NUMBER(20), how_much NUMBER(5,2), adddate_r DATE, date_from DATE, date_to DATE ); I create a table of my type: CREATE TYPE t_tab_read AS TABLE OF t_read; Next step is create a table with my type: enter code hereCREATE TABLE Reading ( id_watermeter NUMBER(20) constraint Watermeter_fk1 references Watermeters(id_watermeter), read t_tab_read ) NESTED TABLE read STORE AS store_read ; Microsoft Visual Studio can not display this type in DataGridView. I use Oracle.Command: C# using Oracle.DataAccess; using Oracle.DataAccess.Client; private void button1_Click(object sender, EventArgs e) { try { //my working class to connect to database ConnectionClass.BeginConnection(); OracleDataAdapter tmp = new OracleDataAdapter(); tmp = ConnectionClass.ReadCommand(ReadClass.test()); DataSet dataset4 = new DataSet(); tmp.Fill(dataset4, "Read1"); dataGridView4.DataSource = dataset4.Tables["Read1"]; } catch (Exception o) { MessageBox.Show(o.Message); } public class ReadClass { public static OracleCommand test() { string sql = "select c.id_watermeter, a. from reading c , table (c.read) a where id_watermeter=1"; ConnectionClass.Command1= new OracleCommand(sql, ConnectionClass.Connection); ConnectionClass.Command1.CommandType = CommandType.Text; return ConnectionClass.Command1; } } I tray: string sql = "select r.id_watermeter, o.id_worker, o.how_much, o.adddate_r, o.date_from, o.date_to from reading r, table (r.read) o where r.id_watermeter=1" string sql = "select a.from reading c , Table (c.read) a where id_watermeter=1" string sql = "select a.id_worker, a.how_much, a.adddate_r, a.date_from, a.date_to from reading c , table (c.read) a where id_watermeter=1" string sql = "select c.id_watermeter, a. from reading c , table (c.read) a where id_watermeter=1" Error : Unsuported Oracle data type USERDEFINED encountered Sombady can help me how to fill DataGridView using data from nested table. I am using Oracle 10g XE

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problem in table:

- by Ayyappan.Anbalagan

i had table inside the another table, my inner table display the image, if i enter the text after the inner table,The text should display right side of the table and the bottom of the inner table.how do i do this??? "the below code display the outer table text always displayed bellow the inner table" Heading ## <tr style=" width:500px; float:left;"> <td style="border: thin ridge #008000; text-align:left;" align="left"; > <table class="" style=" border: 1px solid #800000; width:200px; float:left; height: 200px;"> <tr> <td> stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow  </td> </tr> </table> stackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow stackoverflowstackoverflow statackoverflow sta</td> </tr> </table>

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problem in html, table class text stretching out.

- by Andy

Hey people, I've got a slight problem after weeks of html programming. I've got a large table which I use to construct tabs with, details don't really matter. On every tab there is a tab title (which is defined as one single cell in a table with a class from a .css) and under it there are other rows and columns for the table. sample code for the single table with the single cell in it: <table class='tabcontainer_title'><tr><td class='tabcontainer_title'>TEXT</td></tr></table> This table is again positioned in one cell of the table outside it, which has a different class 'tabcontainer_content' This is in the CSS: .tabcontainer_title{ background-color : #58af34; background-image : url(); text-align : right; vertical-align : top; margin-top : 0px; margin-right : 0px; margin-bottom : 0px; margin-left : 0px; padding-top : 5px; padding-right : 10px; padding-bottom : 5px; padding-left : 0px; font-size : 14px; font-style : normal; color : #000000; } .tabcontainer_content{ width : 100%; font-weight : bolder; background-color : #58af34; color : #000000; padding : 0px; border-collapse : collapse; } The problem I'm experiencing right now is that if there are like 3 rows in the table, which means there's a lot of emtpy space instead of those rows, the text in the tab title has a large margin from the top: but I haven't configured any margin to be present. When the table is full of rows though, hence the table is full, then the tab title holds no unnecessary empty space above the text. What am I missing here?

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Inheritance Mapping Strategies with Entity Framework Code First CTP5: Part 2 – Table per Type (TPT)

- by mortezam

In the previous blog post you saw that there are three different approaches to representing an inheritance hierarchy and I explained Table per Hierarchy (TPH) as the default mapping strategy in EF Code First. We argued that the disadvantages of TPH may be too serious for our design since it results in denormalized schemas that can become a major burden in the long run. In today’s blog post we are going to learn about Table per Type (TPT) as another inheritance mapping strategy and we'll see that TPT doesn’t expose us to this problem. Table per Type (TPT)Table per Type is about representing inheritance relationships as relational foreign key associations. Every class/subclass that declares persistent properties—including abstract classes—has its own table. The table for subclasses contains columns only for each noninherited property (each property declared by the subclass itself) along with a primary key that is also a foreign key of the base class table. This approach is shown in the following figure: For example, if an instance of the CreditCard subclass is made persistent, the values of properties declared by the BillingDetail base class are persisted to a new row of the BillingDetails table. Only the values of properties declared by the subclass (i.e. CreditCard) are persisted to a new row of the CreditCards table. The two rows are linked together by their shared primary key value. Later, the subclass instance may be retrieved from the database by joining the subclass table with the base class table. TPT Advantages The primary advantage of this strategy is that the SQL schema is normalized. In addition, schema evolution is straightforward (modifying the base class or adding a new subclass is just a matter of modify/add one table). Integrity constraint definition are also straightforward (note how CardType in CreditCards table is now a non-nullable column). Another much more important advantage is the ability to handle polymorphic associations (a polymorphic association is an association to a base class, hence to all classes in the hierarchy with dynamic resolution of the concrete class at runtime). A polymorphic association to a particular subclass may be represented as a foreign key referencing the table of that particular subclass. Implement TPT in EF Code First We can create a TPT mapping simply by placing Table attribute on the subclasses to specify the mapped table name (Table attribute is a new data annotation and has been added to System.ComponentModel.DataAnnotations namespace in CTP5): public abstract class BillingDetail { public int BillingDetailId { get; set; } public string Owner { get; set; } public string Number { get; set; } } [Table("BankAccounts")] public class BankAccount : BillingDetail { public string BankName { get; set; } public string Swift { get; set; } } [Table("CreditCards")] public class CreditCard : BillingDetail { public int CardType { get; set; } public string ExpiryMonth { get; set; } public string ExpiryYear { get; set; } } public class InheritanceMappingContext : DbContext { public DbSet<BillingDetail> BillingDetails { get; set; } } If you prefer fluent API, then you can create a TPT mapping by using ToTable() method: protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<BankAccount>().ToTable("BankAccounts"); modelBuilder.Entity<CreditCard>().ToTable("CreditCards"); } Generated SQL For QueriesLet’s take an example of a simple non-polymorphic query that returns a list of all the BankAccounts: var query = from b in context.BillingDetails.OfType<BankAccount>() select b; Executing this query (by invoking ToList() method) results in the following SQL statements being sent to the database (on the bottom, you can also see the result of executing the generated query in SQL Server Management Studio): Now, let’s take an example of a very simple polymorphic query that requests all the BillingDetails which includes both BankAccount and CreditCard types: projects some properties out of the base class BillingDetail, without querying for anything from any of the subclasses: var query = from b in context.BillingDetails select new { b.BillingDetailId, b.Number, b.Owner }; -- var query = from b in context.BillingDetails select b; This LINQ query seems even more simple than the previous one but the resulting SQL query is not as simple as you might expect: -- As you can see, EF Code First relies on an INNER JOIN to detect the existence (or absence) of rows in the subclass tables CreditCards and BankAccounts so it can determine the concrete subclass for a particular row of the BillingDetails table. Also the SQL CASE statements that you see in the beginning of the query is just to ensure columns that are irrelevant for a particular row have NULL values in the returning flattened table. (e.g. BankName for a row that represents a CreditCard type) TPT ConsiderationsEven though this mapping strategy is deceptively simple, the experience shows that performance can be unacceptable for complex class hierarchies because queries always require a join across many tables. In addition, this mapping strategy is more difficult to implement by hand— even ad-hoc reporting is more complex. This is an important consideration if you plan to use handwritten SQL in your application (For ad hoc reporting, database views provide a way to offset the complexity of the TPT strategy. A view may be used to transform the table-per-type model into the much simpler table-per-hierarchy model.) SummaryIn this post we learned about Table per Type as the second inheritance mapping in our series. So far, the strategies we’ve discussed require extra consideration with regard to the SQL schema (e.g. in TPT, foreign keys are needed). This situation changes with the Table per Concrete Type (TPC) that we will discuss in the next post. References ADO.NET team blog Java Persistence with Hibernate book a { text-decoration: none; } a:visited { color: Blue; } .title { padding-bottom: 5px; font-family: Segoe UI; font-size: 11pt; font-weight: bold; padding-top: 15px; } .code, .typeName { font-family: consolas; } .typeName { color: #2b91af; } .padTop5 { padding-top: 5px; } .padTop10 { padding-top: 10px; } p.MsoNormal { margin-top: 0in; margin-right: 0in; margin-bottom: 10.0pt; margin-left: 0in; line-height: 115%; font-size: 11.0pt; font-family: "Calibri" , "sans-serif"; }

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How to delete child table records during the update of parent table using Hibernate

- by Harsha

I have a Parent Table A and child tables B,C with many to one relations. Lets say I have data like, for primary key 1 in parent table A I have 3 rows in child table B and 4 rows in child table C. Now if I want to delete the rows of the child table during an update of the parent table(that means Now, I want to update the table only with one row in each child tables and delete the other rows in them) then how to handle this scenario in hibernate?

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INSERT 0..n records into table 'A' based on content of table 'B' in MySql 5

- by Robert Gowland

Using MySql 5, I have a task where I need to update one table based on the contents of another table. For example, I need to add 'A1' to table 'A' if table 'B' contains 'B1'. I need to add 'A2a' and 'A2b' to table 'A' if table 'B' contains 'B2', etc.. In our case, the value in table 'B' we're interested is an enum. Right now I have a stored procedure containing a series of statements like: INSERT INTO A SELECT 'A1' FROM B WHERE B.Value = 'B1'; --Repeat for 'B2' -> 'A2a'; 'B2' -> 'A2b'; 'B3' -> 'A3', etc... Is there a nicer more DRY way of accomplishing this? Edit: There may be values in table 'B' that have no equivalent value for table 'A'.

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mysql master slave "table already exists" but table not exists

- by Korjavin Ivan

I have 1 master mysql process, and 2 slave. Today on both slaves i see : Error 'Table 'bgbilling.contract_status_balance_dump' already exists' on query. Default database: 'bgbilling'. Query: 'CREATE TABLE contract_status_balance_dump( UNIQUE(cid) ) SELECT cid, MAX(yy*12+(mm-1))%12 + 1 AS mm,FLOOR(MAX(yy*12+(mm-1)) / 12) AS yy FROM contract_balance GROUP BY cid' "show tables" does not show this table. I tryed stop slave , and do "drop table contract_status_balance_dump" but: ERROR 1051 (42S02): Unknown table 'contract_status_balance_dump' How its possible? And how fix that?

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Vaadin table hide columns and container customization

- by Alex

Hello I am testing a project, using Vaadin and Hibernate. I am trying to use the HbnContainer class to show data into table. The problem is that I do not want to show all the properties of the two classes in the table. For example: @Entity @Table(name="users") class User { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Long id; private String name; @ManyToOne(cascade=CascadeType.PERSIST) private UserRole role; //getters and setters } and a second class: @Entity @Table(name="user_roles") class UserRole { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Long id; private String name; //getters and setters } Next, I retrieve my data using the HbnContainer, and connect it to the table: HbnContainer container = new HbnContainer(User.class, app); table.setContainerDataSource(container); The Table will only display the columns from User, and for the "role" it will put the role id instead. How can I hide that column, and replace it with the UserRole.name ? I managed to use a ColumnGenerator() to get the string value in the table, for the UserRole - but I couldn't remove the previous column, with the numerical value. What am I missing? Or, what is the best way to "customize" your data, before displaying a table (if i want to show data in a table from more than one object type.. what do I do?) If I can't find a simple solution soon, I think I will just build the tables "by hand".. So, any advice on this matter? Thank you, Alex

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Dojo Table not Rendering in IE6

- by Mike Carey

I'm trying to use Dojo (1.3) checkBoxes to make columns appear/hide in a Dojo Grid that's displayed below the checkBoxes. I got that functionality to work fine, but I wanted to organize my checkBoxes a little better. So I tried putting them in a table. My dojo.addOnLoad function looks like this: dojo.addOnLoad(function(){ var checkBoxes = []; var container = dojo.byId('checkBoxContainer'); var table = dojo.doc.createElement("table"); var row1= dojo.doc.createElement("tr"); var row2= dojo.doc.createElement("tr"); var row3= dojo.doc.createElement("tr"); dojo.forEach(grid.layout.cells, function(cell, index){ //Add a new "td" element to one of the three rows }); dojo.place(addRow, table); dojo.place(removeRow, table); dojo.place(findReplaceRow, table); dojo.place(table, container); }); What's frustrating is: 1) Using the Dojo debugger I can see that the HTML is being properly generated for the table. 2) I can take that HTML and put just the table in an empty HTML file and it renders the checkBoxes in the table just fine. 3) The page renders correctly in Firefox, just not IE6. The HTML that is being generated looks like so: <div id="checkBoxContainer"> <table> <tr> <td> <div class="dijitReset dijitInline dijitCheckBox" role="presentation" widgetid="dijit_form_CheckBox_0" wairole="presentation"> <input class="dijitReset dijitCheckBoxInput" id="dijit_form_CheckBox_0" tabindex="0" type="checkbox" name="" dojoattachevent= "onmouseover:_onMouse,onmouseout:_onMouse,onclick:_onClick" dojoattachpoint="focusNode" unselectable="on" aria-pressed="false"/> </div> <label for="dijit_form_CheckBox_0"> Column 1 </label> </td> <td> <div class="dijitReset dijitInline dijitCheckBox" role="presentation" widgetid="dijit_form_CheckBox_1" wairole="presentation"> <input class="dijitReset dijitCheckBoxInput" id="dijit_form_CheckBox_1" tabindex="0" type="checkbox" name="" dojoattachevent= "onmouseover:_onMouse,onmouseout:_onMouse,onclick:_onClick" dojoattachpoint="focusNode" unselectable="on" aria-pressed="false"/> </div> </td> </tr> <tr> ... </tr> </table> </div> I would have posted to the official DOJO forums, but it says they're deprecated and they're using a mailing list now. They said if a mailing list doesn't work for you, use stackoverflos.com. So, here I am! Thanks for any insight you can provide.

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How to resize table via javascript in IE?

- by MartyIX

I've got this table: <table id="correctness" style="overflow: hidden;"> <tr><td style="overflow: hidden;"> <div id="correctness-message"></div> <span class="hide"> <button type="button" class="hide" onclick="new DisplayEffect('correctness').Hide(500);">Hide</button> </span> </td> </tr> </table> and a function for resizing the table: function resize(element, size) { element.style.height = size + "px";}; which is called for a certain amount of time (e.g. 1 second) with the ID of table (i.e. "correctness") in order to resize the table from zero height to its full height. This code works in Firefox and Chrome but it doesn't work in IE8. What it does is that it displays right away whole table even thought the height set in "resize" method is much lower. It seems that the cell sets the height of parent table and not the other way around. Is it possible to change the behaviour? I like changing the height of the table better because I can set visibility of the table easily. Thanks for any help!

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mysql alter to table

- by user485783

Hi, I drop the mysql alter code below to database via phpmyadmin one by one, it it work fine, is there anyone could help me how to drop it all together at once? or do you know the the samples of php code that may execute it? just let me know please. thanks in advace ALTER TABLE user ADD title varchar(16) COLLATE utf8_bin NOT NULL DEFAULT '' AFTER user_id ALTER TABLE customer ADD title varchar(16) COLLATE utf8_bin NOT NULL DEFAULT '' AFTER customer_id ALTER TABLE customer ADD date_birtdate datetime NOT NULL DEFAULT '0000-00-00 00:00:00' AFTER lastname ALTER TABLE customer ADD security_question varchar(96) COLLATE utf8_bin NOT NULL DEFAULT '' AFTER fax ALTER TABLE customer ADD security_answer varchar(96) COLLATE utf8_bin NOT NULL DEFAULT '' AFTER fax ALTER TABLE customer ADD pin_number text COLLATE utf8_bin AFTER password ALTER TABLE customer ADD notes text COLLATE utf8_bin AFTER bank_number ALTER TABLE customer ADD last_active datetime NOT NULL DEFAULT '0000-00-00 00:00:00' AFTER date_added

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When to use SQL Table Alias

- by Rossini

I curious to know how people are using table alias. The other developers where I work always use table alias, and always use the alias of a, b, c, ect. Here's an example SELECT a.TripNum, b.SegmentNum, b.StopNum, b.ArrivalTime FROM Trip a, Segment b WHERE a.TripNum = b.TripNum I disagree with them, and think table alias should be use more sparingly. I think it should be used when including the same table twice in a query, or when the table name is very long and using a shorter name in the query will make the query easier to read. I also think the alias should be a good name instead of a letter. In the above example if I felt I needed to use 1 letter table alias I would use t for the Trip table and s for the segment table.

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Adjust width of td to make make row widths even

- by user1729886

I am trying to produce a table with a different number of cells in each row. The first row is a header row (every other row contains cells). This header is the width of the table. The second row has 2 cells in it... the third has 1 cell... the fourth has 4 cells... the fifth and final row has 3 cells. I want the table set up so that the rows span the full width of the table. If the table is 1000px... The header would be 1000px wide the cells in the 2nd row would be 500px EACH the cell in the 3rd row would be 1000px the cells in the 4th row would be 250px EACH and the cells in the 5th row would be 333px, 334px, and 333px each (left-to-right) I figured out I could use colspan for the first 4 rows, but the 5th (with 3 cells) would require a non-integer value. The cells in the 5th row won't expand beyond their column without colspan that I can tell... trying the width:## CSS code inside a div tag for each cell inside the td tag creating a class or classes that define the cell widths id-ing each cell, with or without a div tag, and defining widths individually and adjuting the table-layout: option After several days, I'm now at my rope's end. The only thing I can come up with is deliberately tripling the number of cells in each row so that colspan would be all integer values. That sounds inconvenient and unreasonably difficult to format the table the way I'd like. It's a table of Batman movies for a website -- a practice website I'm building, in order to learn HTML/CSS. I've been working on-and-off with HTML for several months, and CSS for a few weeks. PS: It is not being used for layout, I am simply trying to adjust the layout of the table itself.

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Insert Query for table

- by shanks

How to add data from one table to another table with new data in sql

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Can we solve the table row background image problem, in chrome, in multi celled tables??

- by Ya'el

It is frequently asked – but I haven’t seen a good answer yet (and I looked). If you set a background image in CSS to a table row- the image will repeat itself in every cell. If you set the position: relative (for the row) and set the background-image: none (for the cells) it solves the problem on IE but not on chrome! I can't use background positioning since there are many calls and their size varies. (And the picture is not symmetrical- It's a fade out from one side. Anybody?? Example for the css code : tr { height: 30px; position:relative;} tr.green {background: url('green_30.png') no-repeat left top;} tr.orange {background: url('oranger_30.png') no-repeat left top;} tr.red {background: url('red_30.png') no-repeat left top;} td {background-image:none;} The HTML is basic - A multi cell table. The goal is to have different colors fade into every row, but it could be any non-pattern image.

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Using list() to extract a data.table inside of a function

- by Nathan VanHoudnos

I must admit that the data.table J syntax confuses me. I am attempting to use list() to extract a subset of a data.table as a data.table object as described in Section 1.4 of the data.table FAQ, but I can't get this behavior to work inside of a function. An example: require(data.table) ## Setup some test data set.seed(1) test.data <- data.table( X = rnorm(10), Y = rnorm(10), Z = rnorm(10) ) setkey(test.data, X) ## Notice that I can subset the data table easily with literal names test.data[, list(X,Y)] ## X Y ## 1: -0.8356286 -0.62124058 ## 2: -0.8204684 -0.04493361 ## 3: -0.6264538 1.51178117 ## 4: -0.3053884 0.59390132 ## 5: 0.1836433 0.38984324 ## 6: 0.3295078 1.12493092 ## 7: 0.4874291 -0.01619026 ## 8: 0.5757814 0.82122120 ## 9: 0.7383247 0.94383621 ## 10: 1.5952808 -2.21469989 I can even write a function that will return a column of the data.table as a vector when passed the name of a column as a character vector: get.a.vector <- function( my.dt, my.column ) { ## Step 1: Convert my.column to an expression column.exp <- parse(text=my.column) ## Step 2: Return the vector return( my.dt[, eval(column.exp)] ) } get.a.vector( test.data, 'X') ## [1] -0.8356286 -0.8204684 -0.6264538 -0.3053884 0.1836433 0.3295078 ## [7] 0.4874291 0.5757814 0.7383247 1.5952808 But I cannot pull a similar trick for list(). The inline comments are the output from the interactive browser() session. get.a.dt <- function( my.dt, my.column ) { ## Step 1: Convert my.column to an expression column.exp <- parse(text=my.column) ## Step 2: Enter the browser to play around browser() ## Step 3: Verity that a literal X works: my.dt[, list(X)] ## << not shown >> ## Step 4: Attempt to evaluate the parsed experssion my.dt[, list( eval(column.exp)] ## Error in `rownames<-`(`*tmp*`, value = paste(format(rn, right = TRUE), (from data.table.example.R@1032mCJ#7) : ## length of 'dimnames' [1] not equal to array extent return( my.dt[, list(eval(column.exp))] ) } get.a.dt( test.data, "X" ) What am I missing? Update: Due to some confusion as to why I would want to do this I wanted to clarify. My use case is when I need to access a data.table column when when I generate the name. Something like this: set.seed(2) test.data[, X.1 := rnorm(10)] which.column <- 'X' new.column <- paste(which.column, '.1', sep="") get.a.dt( test.data, new.column ) Hopefully that helps.

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HTML Email template Table help needed

- by user1870691

I need help setting up an email newsletter template as one of the columns is not being displayed properly, the column containing heading 2 is not being displayed properly it is being displayed towards right side of the page instead of aligning with the template elements. Here is the code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> </head> <body>                                         <table border="0" align="center" cellpadding="0" cellspacing="0" class="cont-bg" bgcolor="#f1f1f1" style="background-color: #f1f1f1; padding: 27px 0px 0px; width: 100%; background-position: initial initial; background-repeat: initial initial;"> <tbody> <tr> <td align="center" valign="top" width="1133">                                                                                                                                  <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 650px;"> <tbody> <tr> <td align="left" valign="top">                                                                   <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 650px; height: 682px;"> <tbody> <tr> <td colspan="2" align="right" valign="top" mc:edit="view" style="font: normal 12px arial, helvetica, sans-serif; color: #000000; padding-bottom: 22px;">You can’t see this email?<a href="#"> View it in your browser.</a></td> </tr> <tr> <td width="287" align="left" valign="top" bgcolor="#ffffff" style="background: #fff;">                                    <p align="left"><br /> <img src="commstellogo.png" width="208" height="45" border="0" align="left" /></p> </td>  <td width="363" height="94" align="left" valign="middle" bgcolor="#ffffff" style="background: #fff;">                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 340px;"> <tbody> <tr> <td align="right" valign="top" mc:edit="date" style="font: bold 18px arial, helvetica, sans-serif; color: #2f2f2f; text-transform: uppercase; padding-bottom: 8px;">01727 260 101</td> </tr> <tr> <td align="left" valign="top">                                                                                                                  <table border="0" cellspacing="0" cellpadding="0" style="width: 340px;"> <tbody> <tr> <td width="16" align="left" valign="top"><img mc:edit="h-icin" src="images/home-icon.png" width="16" height="19" alt="" /></td> <td width="64" align="left" valign="middle" mc:edit="h-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">Home</a></td> <td width="16" align="left" valign="top"><img mc:edit="s-icon" src="images/setting.png" width="16" height="19" alt="" /></td> <td width="79" align="left" valign="middle" mc:edit="s-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">Services</a></td> <td width="16" align="left" valign="top"><img mc:edit="a-icon" src="images/about-us.png" width="16" height="19" alt="" /></td> <td width="77" align="left" valign="middle" mc:edit="a-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">About us</a></td> <td width="18" align="left" valign="top"><img mc:edit="s-icon" src="images/support.png" width="16" height="19" alt="" /></td> <td width="54" align="right" valign="middle" mc:edit="s-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#">Contact</a></td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </td> </tr> <tr> <td colspan="2" align="left" valign="top" height="548">                        <table border="0" cellspacing="0" cellpadding="0" style="width: 650px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="banner-image" src="#" width="649" height="356" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 25px 0px 18px 20px; background: #2f2f2f;">                                                       <table border="0" cellspacing="0" cellpadding="0" style="width: 611px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 8px;">Heading Area</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Vivamus interdum mauris urna. Nullam egestas augue elit. Aliquam pretium elit varius metus hendrerit volutpat. <b>20% off</b> Vivamus interdum mauris urna. Nullam egestas augue elit. Aliquam pretium elit varius metus hendrerit volutpat.</td> </tr> <tr> <td align="left" valign="top"><a href="#><img mc:edit="banner-read-more" src="#" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table> </td> </tr> </tbody> </table>            </td> </tr> </tbody> </table>               </td> </tr> <tr></tr> <tr> <td width="330" align="left" valign="top">                                                                                                                                  <table border="0" cellspacing="0" cellpadding="0" style="width: 320px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="two-coulmn-image1" src="businesstelephone.png" width="320" height="172" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 15px 0px 18px 20px; background: #2f2f2f;">                                                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 288px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 5px;">Heading 2</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Praesent viverra dui in orci pulvinar convallis. Nunc interdum, metus eget adipiscing rutrum, leo quam accumsan tellus, eget . It's easy and hassle free!</td> </tr> <tr> <td align="left" valign="top"><a href="#"><img mc:edit="read-more" src="#" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table>    </td> </tr> </tbody> </table>                                                                             </td> <td width="320" align="left" valign="top">                                                                                                                                               <table border="0" cellspacing="0" cellpadding="0" style="width: 320px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="two-coulmn-image2" src="mobiles.png" width="320" height="172" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 15px 0px 18px 20px; background: #2f2f2f;">                                                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 288px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 5px;">Heading 3</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Nunc vel massa metus, vel varius mi. Sed sagittis consectetur nisi, sed imperdiet ipsum interdum non. Nunc consectetur odio et turpis eleifend semper. Pellentesque lorem purus</td> </tr> <tr> <td align="left" valign="top"><a href="#"><img mc:edit="read-more-1" src="images/read-more.png" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table>                </td> </tr> </tbody> </table>                                                   </td> </tr>  <tr> <td> </td> </tr> </tbody> </table> </td> </tr> <tr> <td align="left" valign="top">           <table border="0" cellspacing="0" cellpadding="0" style="width: 687px;"> <tbody> <tr> <td align="center" valign="top" bgcolor="#ffffff" style="background: #fff; padding: 28px 0px 27px 0px;" width="687">                                      <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 675px;"> <tbody> <tr> <td align="center" valign="top" mc:edit="un-sp-text" style="font: normal 12px arial, helvetica, sans-serif; color: #737373; line-height: 18px;" width="675">                                    <p align="center"><b>Copyright © 2012 Company - Registered & Dales 07765116</b></p> </td> </tr> <tr> <td align="center" valign="top" mc:edit="c-right-text" style="font: bold 12px arial, helvetica, sans-serif; color: #737373; line-height: 18px;" width="675">                                                <p align="center">Company Address<br /> T: 023227 000 201  E: <a href="#">[email protected]</a>  W: <a href="#">company</a></p> </td> </tr> </tbody> </table> </td> </tr> <tr> <td align="center" valign="top" style="padding: 20px 0px 35px 0px;" width="687">                        <p align="center">If you wish to unsubscribe from this email, please click here</p> </td> </tr> </tbody> </table> </td> </tr> </tbody> </table>              </body> </html>

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When empty field comes, removed the row in the Grouped Table view in iPhone?

- by Pugal Devan

Hi friends, I have displayed the datas in grouped table view. The data's are displayed in the table view from XML parsing. I have 2 section of the table view, the section one has three rows and section two has two rows. section 1 -> 3 Rows section 2 - > 2 Rows. Now i want to check, if anyone of the string is empty then i should remove the empty cells, so i have faced some problems, if i have removed any empty cell, then it will changed the index number. So how can i check, anyone of the field is empty?, Because some times more number of empty field will come, so that the index position will be change. So please send me any sample code or link for that? How can i achieve this? Sample code, - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section == 0) { if([userEmail isEqualToString:@" "] || [phoneNumber isEqualToString:@" "] || [firstName isEqualToString:@" "]) { return 2; } else { return 3; } } if (section == 1) { if(![gradYear isEqualToString:@" "] || ![graduate isEqualToString:@" "]) { return 1; } else { return 2; } return 0; } Please Help me out!!! Thanks.

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sfdisk restore partition table if two hardisk have different sizes

- by MA1

What will happen if i try to restore the partition table of a larger hard disk to smaller hard disk, for example: partition table of 250GB hard disk to a 80GB hard disk using sfdisk like this. sfdisk /dev/sda < PartitionTable250.txt Will sfdisk detect it? I think there will be no problem if the partition table of a smaller hard disk is going to be restored on a larger hard disk?

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