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• What is the reason not to use select * ?

  - by Chris Lively

  I've seen a number of people claim that you should specifically name each column you want in your select query. Assuming I'm going to use all of the columns anyway, why would I not use SELECT *? Even considering the question from 9/24, I don't think this is an exact duplicate as I'm approaching the issue from a slightly different perspective. One of our principles is to not optimize before it's time. With that in mind, it seems like using SELECT * should be the preferred method until it is proven to be a resource issue or the schema is pretty much set in stone. Which, as we know, won't occur until development is completely done. That said, is there an overriding issue to not use SELECT *?

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• .select rows from datatable by DateTime column (hours)

  - by nCdy

  DatarowsForOneDay = dt.Select(dt.Columns[0].Caption + "='" + x.ToString("dd/MM/yyyy HH") + "'"); doesn't works, but DatarowsForOneDay = dt.Select(dt.Columns[0].Caption + "='" + x.ToString("dd/MM/yyyy") + "'"); works. So how can I select the date with a same hour ... ?

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• select a database and in that select tables. using c# . use web config

  - by syedsaleemss

  Im using c# .net windows form application. I have many databases created using sql server Management studio 2005. Each database has several tables. i have a button, when clicked should allow me to select a database among several databases and in that database i want to select a single table. Later i need to display the contents of the selected table into a datagrid view.I came to know that it can be done using Webconfig. How can i acheive this? It goes like this a) select a database b) In that database select a table c) display the contents into a datagridview.

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• Creating seed model from data already in DB

  - by Nick Brown

  Is there a way to convert data in an existing database into objects that can easily be put into a seed method? Essentially I'd like to let some people add lines to my DB via a form and then convert that into an object that I can re-seed the DB anytime I need to make changes. The database itself is created via code-first using the following model: public class Combo { public int Id { get; set; } public string MainPrefix { get; set; } public string MainDescriptor { get; set; } public string MainDish { get; set; } public string Connector { get; set; } public string SecondaryDescriptor { get; set; } public string SecondaryDish { get; set; } }

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• SQL Select for multiple where clause

  - by Tony

  Hi, I am trying to create SQL Select that returns counts of a certain field based on a field. So, here is what I am trying to do. Select count(distinct id) as TotalCount, -- this will be the total of id count(distinct id where type='A') as TotalA, -- this will be total when type='A' count(distinct id where type='B') as TotalB -- This will be total when type = 'B' from MyTable Basically, TotalCount = TotalA + TotalB. How can I achieve this in SQL Select Statement? Thanks.

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• SELECT table name that is inside UNION

  - by LexRema

  I have two same tables. I need to union them in such way: SELECT f1,f2, xxx FROM (SELECT * FROM tbl1 UNION ALL SELECT * FROM tbl2) where xxx would query for a table name, where f1 and f2 fields are taken from. Example output: 123 345 'tbl1' -- this rows are from the first table 121 345 'tbl1' 121 345 'tbl1' 123 345 'tbl1' 124 345 'tbl1' 125 345 'tbl2' -- this rows are from the second table 127 345 'tbl2' Thank you in advance.

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• Automaically select the lastrow in PivotTable SourceData to avoid (blanks)

  - by Adam

  Hi A little help needed, I have a Macro automatically creating pivot tables and charts, this is all working fine but I am getting (blank) in my pivot table becuase my range is all the way to 65536. How do I automatically get the lastrow / column in my source data so I dont get any blanks. The data is changing constantly so this needs to be automatic Here is the source data, I am looking to get the R65536C37 to be automatically generated based on the lastcolumn of the "raw" sheet ActiveWorkbook.PivotCaches.Add(SourceType:=xlDatabase, SourceData:= _ "raw!R1C1:R65536C37").CreatePivotTable _ TableDestination:="Frontpage!R7C1", TableName:="PivotTable2", _ DefaultVersion:=xlPivotTableVersion10 I have tried; LastRow = ActiveSheet.UsedRange.Rows.Count SourceData:= "raw!R1C1:" & LastRow & C37" Pivot Macro Sheets("Frontpage").Select Range("A7").Select ActiveWorkbook.PivotCaches.Add(SourceType:=xlDatabase, SourceData:= _ "raw!R1C1:R65536C37").CreatePivotTable _ TableDestination:="Frontpage!R7C1", TableName:="PivotTable2", _ DefaultVersion:=xlPivotTableVersion10 Sheets("Frontpage").Select Cells(7, 1).Select ActiveSheet.Shapes.AddChart.Select ActiveChart.SetSourceData Source:=Range("Frontpage!$A$7:$H$22") ActiveChart.ChartType = xlColumnClustered With ActiveSheet.PivotTables("PivotTable2").PivotFields("Priority") .Orientation = xlRowField .Position = 1 End With ActiveSheet.PivotTables("PivotTable2").AddDataField ActiveSheet.PivotTables( _ "PivotTable2").PivotFields("Case ID"), "Count of Case ID", xlCount ActiveChart.Parent.Name = "IncidentsbyPriority" ActiveChart.ChartTitle.Text = "Incidents by Priority" Dim RngToCover As Range Dim ChtOb As ChartObject Set RngToCover = ActiveSheet.Range("D7:L16") Set ChtOb = ActiveSheet.ChartObjects("IncidentsbyPriority") ChtOb.Height = RngToCover.Height ' resize ChtOb.Width = RngToCover.Width ' resize ChtOb.Top = RngToCover.Top ' reposition ChtOb.Left = RngToCover.Left ' reposition Any help would be greatly appreciated. I need to repeat this in four other pivots so as to avoid getting (blank) in my tables and charts.

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• Why does SQL Server 2000 treat SELECT test.* and SELECT t.est.* the same?

  - by Chris Pebble

  I butter-fingered a query in SQL Server 2000 and added a period in the middle of the table name: SELECT t.est.* FROM test Instead of: SELECT test.* FROM test And the query still executed perfectly. Even SELECT t.e.st.* FROM test executes without issue. I've tried the same query in SQL Server 2008 where the query fails (error: the column prefix does not match with a table name or alias used in the query). For reasons of pure curiosity I have been trying to figure out how SQL Server 2000 handles the table names in a way that would allow the butter-fingered query to run, but I haven't had much luck so far. Any sql gurus know why SQL Server 2000 ran the query without issue? Update: The query appears to work regardless of the interface used (e.g. Enterprise Manager, SSMS, OSQL) and as Jhonny pointed out below it bizarrely even works when you try: SELECT TOP 1000 dbota.ble.* FROM dbo.table

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• Does table columns increase select statement execution time

  - by paokg4

  I have 2 tables, same structure, same rows, same data but the first has more columns (fields). For example: I select the same 3 fields from both of them (SELECT a,b,c FROM mytable1 and then SELECT a,b,c FROM mytable2) I've tried to run those queries on 100,000 records (for each table) but at the end I got the same execution time (0.0006 sec) Do you know if the number of the columns (and in the end the size of the one table is bigger than the other) has to do something with the query execution time?

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• Distinct select on Oracle

  - by funktku

  What i am trying to do is a simple recommender , must take the biggest weighted top 40 element's node2 element. Calculation for weight comes from (E.WEIGHT * K.GRADE). Now this code succesfully returns top 40 elements. However, i don't want E.NODE2 to return duplicates. POSTGRE SQL allowed me to do SELECT DISTINCT ON (NODE2) E.NODE2 , (E.WEIGHT * K.GRADE). How can i do the same in oracle? The complete sql query; SELECT * FROM (SELECT DISTINCT E.NODE2 , (E.WEIGHT * K.GRADE) FROM KUAISFAST K, EDGES E WHERE K.ID = 1 AND K.COURSE_ID = E.NODE1 AND E.NODE2 NOT IN( SELECT K2.COURSE_ID FROM KUAISFAST K2 WHERE K2.ID = 1 ) ORDER BY( E.WEIGHT * K.GRADE ) DESC) TEMP WHERE rownum <= 40

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• Comparing two select elements values

  - by user1135192

  I've been been trying to look for a piece of javascript code that compares the values selected by a user in a html form from two <select> tags. So if the user selects a minimum value that is greater than the maximum number an alert box in javascript should be displayed. For example, if the user selects 5 bedrooms from the the MINIMUM bedrooms dropdown list and then 3 bedrooms from the MAXIMUM bedrooms dropdown list, this should not allow the form to be processed when the submit button is clicked. But is fine when 3 is selected from the MINIMUM dropdown list and 5 from the MAXIMUM dropdown list. <form name="search" action="page3.php" method="GET"> <select name="minimumBeds"> <option value="1"> 1 </option> <option value="2"> 2 </option> <option value="3"> 3 </option> <option value="4"> 4 </option> <option value="5"> 5 </option> </select> <select name="maximumBeds"> <option value="1"> 1 </option> <option value="2"> 2 </option> <option value="3"> 3 </option> <option value="4"> 4 </option> <option value="5"> 5 </option> </select> </form>

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• Zend_Search_Lucene vs SOLR

  - by spacemonkey

  Hi, I have recenlty stumbled into Zend Lucene port of Lucene project. I have a little bit experience with SOLR so I would like to know what is the difference between two of them especially from performance and installation side. As much as I know SOLR requires Tomcat serverlet running in web hosting in order to work, what about Zend Lucene library? I am also a bit confused what means "being implemented on the top of Lucene"?

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• Need common stored procedure for select statememt of all Tables

  - by user239635

  HI, i need common stored procedure for select statement of all tables.Thanks in advance

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• How to transfer SQLite db to web server on android phone (android)

  - by Aditya Mehta

  Hello, I have "BackUpContacts.db" database in SQLiteDatabase, it has a table named "ContactInfo" with column names ContactId, ContactName, MobilePhone1, MobilePhone2, OfficePhone1, OfficePhone2, OfficePhone3, HomePhone1, HomePhone2 and TokenId. What i want is to transfer all data of "ContactInfo" table to the mysql database system at some server (means server has also a table similar to "ContactInfo", where all data of "ContactInfo" will be copied). The last important thing which i want is that, whenever i want to get contacts(of a specified TokenId) i can backup all those from server to the mobile device in an xml file. in short, can here anyone help me how to transfer sqlite db to a web server?

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• retrieve value from db in php

  - by wangdoo

  I have a db in which 1 column value will be always null.I want it to pass to next page but it is passing all values of other column except this null value column. This is my code $row=mysql_query("SELECT * FROM `thirdpartycategorymaster` WHERE ISNULL(`delete`)"); while($row1=mysql_fetch_array($row)) { <td><b><a href="catdel.php?head1=<?php echo $row1['ThirdPartyCategoryName'] . '&&msg1=' . $row1['ThirdPartyCategoryID'] . '&&ctdel=' . $row1['delete']; ?> ">Delete</a></b></td> This my db table ThirdPartyCategoryID ThirdPartyCategoryName delete 29 ecommerce NULL

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• Array "tree" creation from db table

  - by Tural Teyyuboglu

  Trying to create array tree for db driven navigation. Getting following errur: array_key_exists() expects exactly 2 parameters, 1 given on line if (!array_key_exists($tree[$parent]['children'][$id])) Function looks like that $tree = array(); $sql = "SELECT id, parent, name FROM menu WHERE parent ... etc.... "; $results = mysql_query($sql) or die(mysql_error()); while(list($id, $parent, $name) = mysql_fetch_assoc($results)) { $tree[$id] = array('name' => $name, 'children' => array(), 'parent' => $parent); if (!array_key_exists($tree[$parent]['children'][$id])) { $tree[$parent]['children'][$id] = $id; } } Db structure How can I fix that? Whats wrong in this function?

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• mysql condition to select empty fulltext cell?

  - by significance

  i need write a select query to find the number of rows which have an empty fulltext field but for some reason both: select count(id) from table where field is null; and select count(id) from table where field = ""; don't seem to work! what else is there?!

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• Creating objects and referencing before saving object to db

  - by Flexo

  Sorry about the vague title, but i didnt know how to ask the question in one line :) I have an order with nested itemgroups that again have nested items. the user specify the amount of item that he would like to have in each itemgroup. I would like to create these items in the create method of the orders controller when the order itself is being created. I kinda have 2 problems here. First, how do i set the reference of the items, or better yet, put the items into the @order object so they are saved when the @order is saved? the items are being stored in the db as the code is now, but the reference is not set because the order is not stored in the db yet so it doesnt have an id yet. Second, im not sure im using the correct way to get the id from my itemgroup. @order = Order.new(params[:order]) @order.itemgroups.each do |f| f.amount.times do @item = Item.new() @item.itemgroup_id = f.id @item.save end end

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• JQuery - Iterate through SELECT options

  - by user208662

  Hello, I have a SELECT element in HTML. This element represents a drop down list. I'm trying to understand how to iterate through the options in the SELECT element via JQuery. How do I use JQuery to display the value and text of each option in a SELECT element? I just want to display them in an alert() box. Thank you!

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• Extending appengine's db.Property with caching

  - by Noio

  I'm looking to implement a property class for appengine, very similar to the existing db.ReferenceProperty. I am implementing my own version because I want some other default return values. My question is, how do I make the property remember its returned value, so that the datastore query is only performed the first time the property is fetched? What I had is below, and it does not work. I read that the Property classes do not belong to the instances, but to the model definition, so I guess that the return value is not cached for each instance, but overwritten on the model every time. Where should I store this _resolved variable? class PageProperty(db.Property): data_type = Page def get_value_for_datastore(self, model_instance): page = super(PageProperty, self).get_value_for_datastore(model_instance) self._resolved = page return page.key().name() def make_value_from_datastore(self, value): if not hasattr(self, '_resolved'): self._resolved = Page.get_by_name(value) return self._resolved

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• Simple check for SELECT query empty result

  - by den-javamaniac

  Hi. Can anyone point out how to check if a select query returns non empty result set? For example I have next query: SELECT * FROM service s WHERE s.service_id = ?; Should I do something like next: ISNULL(SELECT * FROM service s WHERE s.service_id = ?) to test if result set is not empty?

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• Oracle Reports SELECT INTO Not Selecting

  - by Kevin Cruz

  I'm working on a Report in Oracle Reports Builder, and having issues with my AFTERPFORM trigger. When viewing the report, it seems like the year is being processed properly, while the period and subperiod are using their initial values. I'm confused because they are the exact same select statement, but are not working as intended. Any help would be greatly appreciated! function AfterPForm return boolean is v_subpdenddt_user date; v_subpdenddt_max date; v_rowcount integer; begin select value into year from wos_report_param where parameter = 'year' and sequence_num = :sequencenum; select value into period from wos_report_param where parameter = 'period' and sequence_num = :sequencenum; select value into user_subpd from wos_report_param where parameter = 'subpd' and sequence_num = :sequencenum;

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• JQuery setting the selected attribute on a select list

  - by Rupert

  I have the following html <select id="dropdown"> <option>A</option> <option>B</option> <option>C</option> </select> I have the string "B" so I want to set the selected attrribute on it so it will be: <select id="dropdown"> <option>A</option> <option selected="selected">B</option> <option>C</option> </select> How would I do this in JQuery?

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• how to leave a gap in select list from left

  - by Mayur

  Hi All, I m trying to leave a gap from left in select list, but its getting problem in firefox and safari please give me source code or any reference link from where i can work... code which i use : <select style="padding:10px"> <option>Male</option> <option>female</option> <option>other</option> </select> Thanks

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• SQL Server, View using multiple select statements

  - by phil

  I've banging my head for hours, it seems simple enough, but here goes: I'd like to create a view using multiple select statements that outputs a Single record-set Example: CREATE VIEW dbo.TestDB AS SELECT X AS 'First' FROM The_Table WHERE The_Value = 'y' SELECT X AS 'Second' FROM The_Table WHERE The_Value = 'z' i wanted to output the following recordset: Column_1 | Column_2 'First' 'Second' any help would be greatly appreciated! -Thanks.

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