Search Results

Search found 30190 results on 1208 pages for 'table row'.

Page 42/1208 | < Previous Page | 38 39 40 41 42 43 44 45 46 47 48 49 | Next Page >

Copy data from Access to the next row in Excel

- by edmon

I have a MS Access database for a small Hotel. On the main form I have Guest Information fields...(Name, Address, Phone#, etc). I also have an Excel file that keeps track of bookings for the Hotel. The following code takes the Guest information from my form in Access and populates the labeled cells in my Excel file. Dim objXLApp As Object Dim objXLBook As Object Set objXLApp = CreateObject("Excel.Application") Set objXLBook = objXLApp.Workbooks.Open("Y:\123files\E\Hotel Reservation.xls") objXLApp.Application.Visible = True objXLBook.ActiveSheet.Range("B2") = Me.GuestFirstName & " " & GuestLastName objXLBook.ActiveSheet.Range("C2") = Me.PhoneNumber objXLBook.ActiveSheet.Range("D2") = Me.cboCheckInDate objXLBook.ActiveSheet.Range("E2") = Me.cboCheckOutDate objXLBook.ActiveSheet.Range("G2") = Me.RoomType objXLBook.ActiveSheet.Range("H2") = Me.RoomNumber End Sub Is there a way to, move to the next row in my Excel file, for a new guests info? EX. I take my first guests info and it populates row 2 of my Excel file. For my next guest it will populate row 3 of my Excel file and so on....

Read the article
Fixing Gatekeeper Row Cardinality Estimate Issues

The Query Optimiser needs a good estimate of the number of rows likely to be returned by each physical operator in order to select the best query plan from the most likely alternatives. Sometimes these estimates can go so wildly wrong as to result in a very slow query. Joe Sack shows how it can happen with SQL Queries on a data warehouse with a star schema. Make working with SQL a breezeSQL Prompt 5.3 is the effortless way to write, edit, and explore SQL. It's packed with features such as code completion, script summaries, and SQL reformatting, that make working with SQL a breeze. Try it now.

Read the article
Highlight column when a row is clicked, depending on condition

- by Fredrik

We have a large matrix with lists of servers on the rows and persons as columns. Then we mark the column/row with an X if the person has access to the server. Pretty basic. But as the matrix grows, it becomes more difficult to quickly find the right person with access. So I'd like some way to make it easier to use In the example above I have clicked on the row "Resource B" and would like all the columns where there is an "X" (User 1, User 2) to be highlighted somehow. Then if I click the row for "Resource C", "User 1" should be highlighted.

Read the article
How to put text in same row but different column if a certain text is present in the same row?

- by melai

How can I put text in the same row but different column if a certain text is present in the same row? Issue Area Correction Done Process changed bin Process skip lap converted to global Security done global migration Process changed bin How can I code this in a macro? For example: If the correction done is in the cell, the Issue should be Process automatically. If the word global is present the Issue should be Security. I have 500 rows and I want to have the code until row 500.

Read the article
IE7 is making my life miserable! Getting gaps between html table columns (w/ colspan) with css togg

- by Art Peterson

Copy/paste this html code snippet and try it out in IE7. When you toggle the hidden columns it leaves a gap between the columns. In Firefox it works fine, the columns touch when minimized. Haven't tried IE8 yet, would be curious to hear how it works there. Any ideas? I've tried a bunch of things in the CSS like table-layout:fixed but no luck. Note: Not looking for a different toggling method because the table I'm really dealing with is 50+ columns wide and 4000+ rows so looping/jquery techniques are too slow. Here's the code - if someone can re-post a working version of it I'll instantly give them the check and be forever in your debt! <DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <script> function toggle() { var tableobj = document.getElementById("mytable"); if (tableobj.className == "") { tableobj.className = "hide1 hide2"; } else { tableobj.className = ""; } } </script> <style> table { border-collapse: collapse; } td, th { border: 1px solid silver; } .hide1 .col1 { display: none; } .hide2 .col2 { display: none; } </style> </head> <body> <input type="button" value="toggle" onclick="toggle();" /> <table id="mytable"> <tr> <th>A</th> <th colspan="2">B</th> <th colspan="2" class="col1">B1</th> <th colspan="2">C</th> <th colspan="2" class="col2">C1</th> </tr> <tr> <td>123</td> <td>456</td> <td>789</td> <td class="col1">123</td> <td class="col1">456</td> <td>789</td> <td>123</td> <td class="col2">456</td> <td class="col2">789</td> </tr> </table> </body> </html>

Read the article
Sorting the columns of an HTML table using JQuery

- by nikolaosk

In this post I will show you how easy is to sort the columns of an HTML table. I will use an external library,called Tablesorter which makes life so much easier for developers. ?here are other posts in my blog regarding JQuery.You can find them all here. You can find another post regarding HTML tables and JQuery here. We will demonstrate this with a step by step example. I will use Visual Studio 2012 Ultimate. You can also use Visual Studio 2012 Express Edition. You can also use VS 2010 editions. 1) Launch Visual Studio. Create an ASP.Net Empty Web application. Choose an appropriate name for your application. 2) Add a web form, default.aspx page to the application. 3) Add a table from the HTML controls tab control (from the Toolbox) on the default.aspx page 4) Now we need to download the JQuery library. Please visit the http://jquery.com/ and download the minified version.Then we need to download the Tablesorter JQuery plugin. Please donwload it, here. 5) We need to reference the JQuery library and the external JQuery Plugin. In the head section ? add the following lines. <script src="jquery-1_8_2_min.js" type="text/javascript"></script> <script src="jquery.tablesorter.js" type="text/javascript"></script>6) We need to type the HTML markup, the HTML table and its columns <body> <form id="form1" runat="server"> <div> <h1>Liverpool Legends</h1> <table style="width: 50%;" border="1" cellpadding="10" cellspacing ="10" class="liverpool"> <thead> <tr><th>Defenders</th><th>MidFielders</th><th>Strikers</th></tr> </thead> <tbody> <tr> <td>Alan Hansen</td> <td>Graeme Souness</td> <td>Ian Rush</td> </tr> <tr> <td>Alan Kennedy</td> <td>Steven Gerrard</td> <td>Michael Owen</td> </tr> <tr> <td>Jamie Garragher</td> <td>Kenny Dalglish</td> <td>Robbie Fowler</td> </tr> <tr> <td>Rob Jones</td> <td>Xabi Alonso</td> <td>Dirk Kuyt</td> </tr> </tbody> </table> </div> </form></body> 7) Inside the head section we also write the simple JQuery code. <script type="text/javascript"> $(document).ready(function() { $('.liverpool').tablesorter(); }); </script> 8) Run your application.This is how the HTML table looks before the table is sorted on the basis of the selected column. 9) Now I will click on the Midfielders header.Have a look at the picture below Tablesorter is an excellent JQuery plugin that makes sorting HTML tables a piece of cake. Hope it helps!!!

Read the article
How to Plug a Small Hole in NetBeans JSF (Join Table) Code Generation

- by MarkH

I was asked recently to provide an assist with designing and building a small-but-vital application that had at its heart some basic CRUD (Create, Read, Update, & Delete) functionality, built upon an Oracle database, to be accessible from various locations. Working from the stated requirements, I fleshed out the basic application and database designs and, once validated, set out to complete the first iteration for review. Using SQL Developer, I created the requisite tables, indices, and sequences for our first run. One of the tables was a many-to-many join table with three fields: one a primary key for that table, the other two being primary keys for the other tables, represented as foreign keys in the join table. Here is a simplified example of the trio of tables: Once the database was in decent shape, I fired up NetBeans to let it have first shot at the code. NetBeans does a great job of generating a mountain of essential code, saving developers what must be millions of hours of effort each year by building a basic foundation with a few clicks and keystrokes. Lest you think it (or any tool) can do everything for you, however, occasionally something tosses a paper clip into the delicate machinery and makes you open things up to fix them. Join tables apparently qualify. :-) In the case above, the entity class generated for the join table (New Entity Classes from Database) included an embedded object consisting solely of the two foreign key fields as attributes, in addition to an object referencing each one of the "component" tables. The Create page generated (New JSF Pages from Entity Classes) worked well to a point, but when trying to save, we were greeted with an error: Transaction aborted. Hmm. A quick debugger session later and I'd identified the issue: when trying to persist the new join-table object, the embedded "foreign-keys-only" object still had null values for its two (required value) attributes...even though the embedded table objects had populated key attributes. Here's the simple fix: In the join-table controller class, find the public String create() method. It will look something like this: public String create() { try { getFacade().create(current); JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("JoinEntityCreated")); return prepareCreate(); } catch (Exception e) { JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured")); return null; } } To restore balance to the force, modify the create() method as follows (changes in red): public String create() { try { // Add the next two lines to resolve: current.getJoinEntityPK().setTbl1id(current.getTbl1().getId().toBigInteger()); current.getJoinEntityPK().setTbl2id(current.getTbl2().getId().toBigInteger()); getFacade().create(current); JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("JoinEntityCreated")); return prepareCreate(); } catch (Exception e) { JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured")); return null; } } I'll be refactoring this code shortly, but for now, it works. Iteration one is complete and being reviewed, and we've met the milestone. Here's to happy endings (and customers)! All the best,Mark

Read the article
Add UIProgressView to a custom UITableViewCell and detect what is the index row

- by Piero

i create a custom UITableViewCell and i add on the Cell a UIProgressView, because when i add a row on the UITableView i download the information from a XML data, and i want use the ProgressView to show the progress of the process, my question is, how i can detect in what index row i have to change the progress bar, and then hidden it?...what is the index path of the row just created? in the: cellForRowAtIndexPath:(NSIndexPath *)indexPath i retrieve information from my Custom UITableViewCell in this way: UILabel *label; label = (UILabel *)[cell viewWithTag:1000]; label.text = [[managedObject valueForKey:@"firstName"] description]; so how i can know the index path row of the row just added, to change then the progress bar?

Read the article
jQuery datepicker onSelect set multiple row values

- by d3020

On the select event of the datepicker I need to add and set values in multiple rows. In other words, I have something like this... Days Value Row 1 1 Row 2 2 Row 3 3 I have the "Days" and "Value" columns as textboxes. When I select a date from the datepicker I need to add the "Days" value for each row to the date selected. That value is what goes into the "Value" column. Example, I select 4/20/2010. The value in each respective row would then be 4/21/2010, 4/22/2010, 4/23/2010. Hopefully this makes sense and thank you for the help in advance.

Read the article
JTable's and DefaultTableModel's row indexes lose their synchronization after I sort JTable

- by Stefanos Kargas

JAVA NETBEANS // resultsTable, myModel JTable resultsTable; DefaultTableModel myModel; //javax.swing.table.DefaultTableModel myModel = (DefaultTableModel) resultsTable.getModel(); // event of clicking on item of table String value = (String) myModel.getValueAt(resultsTable.getSelectedRow(), columnIndex) I use JTable and DefaultTableModel to view a table of various info and I want to get a value of a certain column of the selected index of the table. The code I wrote above works fine except when: I use the sort of the GUI (click on the field name I want to sort on the table) The table is properly sorted but after that when I select a row, it gets the value of the row that was there before the sort. This means that after sorting (using the JTable's GUI) the 'myModel' and 'resultsTable' objects have different row indexes. How do I synchronize those two?

Read the article
UITableView: moving a row into an empty section

- by Frank C

I have a UITableView with some empty sections. I'd like the user to be able to move a row into them using the standard edit mode controls. The only way I can do it so far is to have a dummy row in my "empty" sections and try to hide it by using tableView:heightForRowAtIndexPath: to give the dummy row a height of zero. This seems to leave it as a 1-pixel row. I can probably hide this by making a special type of cell that's just filled with [UIColor groupTableViewBackgroundColor], but is there a better way? This is all in the grouped mode of UITableView UPDATE: Looks like moving rows into empty sections IS possible without any tricks, but the "sensitivity" is bad enough that you DO need tricks in order to make it usable for general users (who won't be patient enough to slowly hover the row around the empty section until things click)

Read the article
How to find NSOutlineView row index when using NSTreeController

- by velocityb0y

I'm using an NSTreeController to manage nodes for an NSOutlineView. When the user adds a new item, I create a new object and insert it: EntityViewEntityNode *newNode = [EntityViewEntityNode nodeWithName:@"New entity" entity:newObject]; // Insert at end of group // NSIndexPath *insertAt = [pathOfGroupNode indexPathByAddingIndex:[selected.children count]]; [entityCollectionTreeController insertObject:newNode atArrangedObjectIndexPath:insertAt]; Now I'd like to open the table column for edit so the user can name the new item. This seems logical: NSInteger row = [entityCollectionOutlineView rowForItem:newNode]; [entityCollectionOutlineView editColumn:0 row:row withEvent:nil select:YES]; However, row is always -1 indicating the object isn't found. Poking around reveals that the tree controller is not actually putting my objects directly in the tree, but is wrapping them in a node object of its own. Anyone have insight into how I would go about getting a row index relative to the outline view, so I can do this (without, hopefully, enumerating everything in the outline view and figuring out the mapping back to my node?)

Read the article
Call click event on last clicked row in YUI datatable

- by Javi

Hello, I have a YUI datatable and I have a function which is invoked when I click on a row: ... YAHOO.keycoes.myDatatable = myDatatable; ... myDatatable.subscribe("rowClickEvent", oneventclickrow); var oneventclickrow = function( args ) { ... } I'd like to invoke the function subscribed to rowClickEvent on the row which is currently highlighted in the datatable (the row which was clicked for the last time). I've tried to do something like this: YAHOO.keycoes.myDatatable.getSelectedRows()[0].rowClickEvent() but getSelectedRows() doesn't return any row. How can I get the highlighted row in the datatable and then call the function associated with rowClickEvent? Thanks

Read the article
Populate new row with VBA button click

- by AME

Hi, I am trying to create a list that adds a new row of data each time a button is clicked. I have the following code assigned to the button when clicked: PurchaseDate = InputBox("Enter Purchase Date:") Sheets("TrackRecord").Select i = 0 Row = i + 1 Range("A2").Select ActiveCell.FormulaR1C1 = Row Range("B2").Select ActiveCell.FormulaR1C1 = "=Dashboard!R26C4*(1/Dashboard!R26C12)" Range("C2").Select ActiveCell.FormulaR1C1 = "=Dashboard!R26C2" Range("D2").Select ActiveCell.FormulaR1C1 = PurchaseDate Range("E2").Select ActiveCell.FormulaR1C1 = "=Dashboard!R26C8 + R2C4" Range("F2").Select ActiveCell.FormulaR1C1 = "=Waterfall!R[8]C[5]" Range("F2").Select Selection.AutoFill Destination:=Range("F2:I2"), Type:=xlFillDefault Range("F2:I2").Select End Sub This code works fine, but I'd like it populate the next row below instead of overwriting the same row each time the button is clicked. I know that I have to iterate through the "Range("A2").select" section, e.g. "Range("A2").select" -- "Range("B2").select" .. But I don't know how to do this in VBA for Excel. That's why I am asking you folks ; ) . Thanks,

Read the article
GridView take a Row

- by GIbboK

Hi I use asp.net 4 and c#. I have a GridView, I would like take a Row when in Edit Mode in my code and find a control. Here my code, but does not work, it takes only the first row for the GridView. Any ideas? protected void uxManageSlotsDisplayer_RowDataBound(object sender, GridViewRowEventArgs e) { switch (e.Row.RowType) { case DataControlRowType.DataRow: // Take Row in Edit Mode DOES NOT WORK PROEPRLY if (e.RowState == DataControlRowState.Edit) { Label myTest = (Label)e.Row.FindControl("uxTest"); } break; }

Read the article
How to Delete a Row with DataTables Plugin?

- by chobo2

Hi I am trying to delete a row using the DataTables plugin. First I don't get the example at all. What I have this is a user checks the row they want to delete. I do this then var row = $('#id :checked').parents('tr'); So I get the row of the checked checkbox. Lets assume they only check one box( if multiple where choose it might be different - might need a jquery each loop). I then try to do this var position = GlobalVariable.fnGetPosition(row); GlobalVariable.fnDeleteRow(position); position is always null and So I have no clue how to do this. http://datatables.net/api

Read the article
Arbitrary Header content for each row in WPF datagrid

- by tk

I'm trying to put row header text based on a converter function of the index of the row. I found a way to bind to the datagridrow like below, but i can't find how to get the row index of the datagridrow object. <DataTemplate x:Key="MyRowHeaderTemplate" DataType="DataRowView"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Margin="1,0,1,0" Padding="1,0,1,0" Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGridRow}}, Path=Item}"/> </DataTemplate> How can i get the row index and use my converter function to set the row header text?

Read the article
change the user informatoin on each row click in the jquery grid

- by kumar

hello friends I am using jquery grid, I have a grid with user data, I need a code to handle to handle the click on each row? that is if I click First row I need to display first row user information in the bottom of the grid, if I click second row I need to dispaly second user iformation on the grid can any body help me out how to handle the click event using jquery/ Here is my code.. $("#table1").Click(function()///// how to handle the click event for each row and how to pass the ID value to change the user each time on click { $("#table2").show(); } thanks

Read the article
Row/column counter in 'apply' functions

- by mortalitysequence

What if one wants to apply a functon i.e. to each row of a matrix, but also wants to use as an argument for this function the number of that row. As an example, suppose you wanted to get the n-th root of the numbers in each row of a matrix, where n is the row number. Is there another way (using apply only) than column-binding the row numbers to the initial matrix, like this? test <- data.frame(x=c(26,21,20),y=c(34,29,28)) t(apply(cbind(as.numeric(rownames(test)),test),1,function(x) x[2:3]^(1/x[1]))) P.S. Actually if test was really a matrix : test <- matrix(c(26,21,20,34,29,28),nrow=3) , rownames(test) doesn't help :( Thank you.

Read the article
C# LINQ join With Just One Row

- by Soo

I'm trying to make a query that grabs a single row from an SQL database and updates it. TableA AId AValue TableB BId AId BValue Ok, so TableA and TableB are linked by AId. I want to select a row in TableB based on AValue using a join. The following query is what I have and only grabs a value from TableB based on AId, I just don't know how to grab a row from TableB using AValue. I know you would need to use a join, but I'm not sure how to accomplish that. var row = DbObject.TableB.Single(x => x.AId == 1) row.BValue = 1; DbObject.SubmitChanges();

Read the article
Output custom messages based on row value

- by decimal

I've made a simple guestbook mysql/php page. An entry is displayed if the approve column has a value of 1. For the adminstrator, I want to display either "message approved" or "not approved". Here's my code: while ($row = mysql_fetch_array ($r)) { print "<p>Guest:" .$row['name']. "</p> <p>Date:" .$row['date']. "</p> <p>Comment:". $row['comment']. "</p>"; if ($row['approve'] = '1') { print '<p>YES, the message has been approved</p>'; } else { print '<p>NO, it hasn\'t been approved</p>'; } Whatever value the if statement checks approve is equal to, all approve values are output as that value.

Read the article
tcpdf table header in each page

- by DragoN

i am using tcpdf to create pdf files with rows of table in the first page of pdf i display some info like : List of table .... and header of table after that i display the rows in table if there much rows it contiunes in the next page without the info [List of table... and header of table] i want to display the header of table only in the next pages here is my code $pdf->SetFont('aefurat', '', 15); $pdf->AddPage('P', 'A4'); $pdf->SetFontSize(17); $pdf->Cell(0, 13, 'List of the Byan Table,'C'); $pdf->SetFont('dejavusans', '', 14); $htmlpersian = 'In / Out List'; $pdf->WriteHTML($htmlpersian, true, 0, true, 0); $pdf->setRTL(false); $pdf->SetFontSize(11); $pdf->setRTL(true); Connect(); $resultsc = mysql_query("SELECT * FROM byan Order By Date "); while($r = mysql_fetch_array($resultsc)) { $printresult .= ' <tr> <td ><center>'.$r['Date'].'</center></td> <td ><center>'.$r['In'].'</center></td> <td ><center>'.$r['Out'].'</center></td> <td ><center>'.$r['Balance'].'</center></td> <td ><center>'.$r['Info'].'</center></td> <td ><center>'.$r['Number'].'</center></td> </tr>'; } $tbl = ' <table cellspacing="0" cellpadding="1" border="1" align="center"> <tr> <td style="width: 13%; background-color:black; color:white;"><center>Date</center></td> <td style="width: 11%; background-color:black; color:white;"><center>In</center></td> <td style="width: 11%; background-color:black; color:white;"><center>Out</center></td> <td style="width: 12%; background-color:black; color:white;"><center>Balance</center></td> <td style="width: 45%; background-color:black; color:white;"><center>Info</center></td> <td style="width: 11%; background-color:black; color:white;"><center>Number</center></td> </tr> '.$printresult.' </table> '; $pdf->writeHTML($tbl, true, false, true, false, ''); the output is First Page: List of the Byan Table In / Out List Table Header rows Second Page: Rows Third Page: Rows i want the output to be like that First Page: List of the Byan Table In / Out List Table Header Rows Second Page: Table Header Rows Third Page: Table Header Rows

Read the article
Joins in single-table queries

- by Rob Farley

Tables are only metadata. They don’t store data. I’ve written something about this before, but I want to take a viewpoint of this idea around the topic of joins, especially since it’s the topic for T-SQL Tuesday this month. Hosted this time by Sebastian Meine (@sqlity), who has a whole series on joins this month. Good for him – it’s a great topic. In that last post I discussed the fact that we write queries against tables, but that the engine turns it into a plan against indexes. My point wasn’t simply that a table is actually just a Clustered Index (or heap, which I consider just a special type of index), but that data access always happens against indexes – never tables – and we should be thinking about the indexes (specifically the non-clustered ones) when we write our queries. I described the scenario of looking up phone numbers, and how it never really occurs to us that there is a master list of phone numbers, because we think in terms of the useful non-clustered indexes that the phone companies provide us, but anyway – that’s not the point of this post. So a table is metadata. It stores information about the names of columns and their data types. Nullability, default values, constraints, triggers – these are all things that define the table, but the data isn’t stored in the table. The data that a table describes is stored in a heap or clustered index, but it goes further than this. All the useful data is going to live in non-clustered indexes. Remember this. It’s important. Stop thinking about tables, and start thinking about indexes. So let’s think about tables as indexes. This applies even in a world created by someone else, who doesn’t have the best indexes in mind for you. I’m sure you don’t need me to explain Covering Index bit – the fact that if you don’t have sufficient columns “included” in your index, your query plan will either have to do a Lookup, or else it’ll give up using your index and use one that does have everything it needs (even if that means scanning it). If you haven’t seen that before, drop me a line and I’ll run through it with you. Or go and read a post I did a long while ago about the maths involved in that decision. So – what I’m going to tell you is that a Lookup is a join. When I run SELECT CustomerID FROM Sales.SalesOrderHeader WHERE SalesPersonID = 285; against the AdventureWorks2012 get the following plan: I’m sure you can see the join. Don’t look in the query, it’s not there. But you should be able to see the join in the plan. It’s an Inner Join, implemented by a Nested Loop. It’s pulling data in from the Index Seek, and joining that to the results of a Key Lookup. It clearly is – the QO wouldn’t call it that if it wasn’t really one. It behaves exactly like any other Nested Loop (Inner Join) operator, pulling rows from one side and putting a request in from the other. You wouldn’t have a problem accepting it as a join if the query were slightly different, such as SELECT sod.OrderQty FROM Sales.SalesOrderHeader AS soh JOIN Sales.SalesOrderDetail as sod on sod.SalesOrderID = soh.SalesOrderID WHERE soh.SalesPersonID = 285; Amazingly similar, of course. This one is an explicit join, the first example was just as much a join, even thought you didn’t actually ask for one. You need to consider this when you’re thinking about your queries. But it gets more interesting. Consider this query: SELECT SalesOrderID FROM Sales.SalesOrderHeader WHERE SalesPersonID = 276 AND CustomerID = 29522; It doesn’t look like there’s a join here either, but look at the plan. That’s not some Lookup in action – that’s a proper Merge Join. The Query Optimizer has worked out that it can get the data it needs by looking in two separate indexes and then doing a Merge Join on the data that it gets. Both indexes used are ordered by the column that’s indexed (one on SalesPersonID, one on CustomerID), and then by the CIX key SalesOrderID. Just like when you seek in the phone book to Farley, the Farleys you have are ordered by FirstName, these seek operations return the data ordered by the next field. This order is SalesOrderID, even though you didn’t explicitly put that column in the index definition. The result is two datasets that are ordered by SalesOrderID, making them very mergeable. Another example is the simple query SELECT CustomerID FROM Sales.SalesOrderHeader WHERE SalesPersonID = 276; This one prefers a Hash Match to a standard lookup even! This isn’t just ordinary index intersection, this is something else again! Just like before, we could imagine it better with two whole tables, but we shouldn’t try to distinguish between joining two tables and joining two indexes. The Query Optimizer can see (using basic maths) that it’s worth doing these particular operations using these two less-than-ideal indexes (because of course, the best indexese would be on both columns – a composite such as (SalesPersonID, CustomerID – and it would have the SalesOrderID column as part of it as the CIX key still). You need to think like this too. Not in terms of excusing single-column indexes like the ones in AdventureWorks2012, but in terms of having a picture about how you’d like your queries to run. If you start to think about what data you need, where it’s coming from, and how it’s going to be used, then you will almost certainly write better queries. …and yes, this would include when you’re dealing with regular joins across multiples, not just against joins within single table queries.

Read the article
Learning PostgreSql: old versions of rows are stored right in the table

- by Alexander Kuznetsov

PostgreSql features multi-version concurrency control aka MVCC. To implement MVCC, old versions of rows are stored right in the same table, and this is very different from what SQL Server does, and it leads to some very interesting consequences. Let us play with this thing a little bit, but first we need to set up some test data. Setting up. First of all, let us create a numbers table. Any production database must have it anyway: CREATE TABLE Numbers ( i INTEGER ); INSERT INTO Numbers ( i ) VALUES...(read more)

Read the article
What happened to HTML table tags?

- by John

I started to code HTML in 1998, and in that time I was used to code a lot table tags, playing with tr and td, I learned many things analysing the source code of many portals on the internet with notepad and Microsoft FrontPage, the latter, aw, how many tables overlapping others, it was fun, I loved that time. However, I abandoned web programming for almost seven years and this year I decided to see what's the web programming today likes. Completely different, there are not table tags anymore, it's full of div and span tags. Why happened ? What are these new tags and why nobody codes in table tags anymore ?

Read the article

< Previous Page | 38 39 40 41 42 43 44 45 46 47 48 49 | Next Page >