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SQL and SQL Server database topics. Includes design, issue resolution and tips.
From time to time, you will need to dynamically set a variable in the middle of your DTS packages. The following code shows you how easy it is to build a variable dynamically. The variable will be filename which contains … Continue reading Using ActiveX to Dynamically set a Variable in an SQL Server DTS Package
Here are a few useful code fragments that I use all the time. You see too many Rows Affected Messages. First, NOCOUNT. If you don’t want SQL Server to return the Row Count
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(20 row(s) affected) |
after you execute a query, here is the code: — Turn off the rows affected message
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<span style="color: #0000ff;">SET NOCOUNT ON</span> |
Once you have executed your queries, you can enable the row count again
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<span style="color: #0000ff;">SET NOCOUNT OFF</span> |
ANSI Warnings interrupt your inserts Next, do you get annoying ANSI errors when inserting data? You can remove those warnings using one simple command.
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<span style="color: #0000ff;">SET ANSI_WARNINGS OFF</span> |
If there is a failure, the inserts will fail. However, … Continue reading Using NOCOUNT, ANSI Warnings and Temp Tables in SQL Server
Let’s say you are importing data from a flat file to SQL Server via DTS. Now, let’s say the date format in the source file is similar to this: YYYYMMDD. If your destination column is a datetime or smalldatetime, SQL … Continue reading Change a Date Format Using ActiveX and SQL DTS Transformations
Well, you knew exactly what you needed when you created a table. Only now when you created a child table, the child table does not update with the information from your main table. Or worse you deleted something from your primary table and it still lives in the child table. You need a foreign key, my friend. This is how you define one after you’ve created your table.
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<span style="color: #0000ff;">ALTER TABLE</span> My_Child_Table <span style="color: #0000ff;">ADD CONSTRAINT</span> FK_User_ID <span style="color: #0000ff;">FOREIGN KEY</span> ( User_ID_In_Child_Table ) <span style="color: #0000ff;">REFERENCES</span> My_Primary_Table ( User_ID_In_Primary_Table ) <span style="color: #0000ff;">ON DELETE CASCADE ON UPDATE CASCADE</span> |
The last two lines are important. In this example, if the user id in the primary table is modified or deleted, the change will cascade to the child table. This ensures … Continue reading Adding Foreign Keys after a table is created in SQL Server
Did you create a table, only to find that you need to add a check constraint? I created a quick example of how to add a check constraint after the table exists. In this example, we want to know if our user is alive or dead. 1 = alive, 0 = dead. Here is the code for SQL server: alter table dbo.Tbl_User_Table add constraint CK_User_Alive check (User_Alive in (0,1)) I don’t know if it will work with MySql, Oracle, etc, so check your documentation. Happy Coding! RudyRudy Rodarte is a SQL Server Database professional based in Austin, TX. Over his … Continue reading Adding Checks after a table is created in SQL Server
