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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. ALTER TABLE My_Child_Table ADD CONSTRAINT FK_User_ID FOREIGN KEY ( User_ID_In_Child_Table ) REFERENCES My_Primary_Table ( User_ID_In_Primary_Table ) ON DELETE CASCADE ON UPDATE CASCADE The last two lines are important. In this example, if … 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
