Sql Stored Procedure: If Variable Is Not Null, Update Statement

I have an update statement in a stored procedure that looks generally like this: Update [TABLE_NAME] Set XYZ=@ABC Is there a good way to only trigger the update statement if the v

Solution 1:

Use a T-SQL IF:

IF @ABCISNOTNULLAND@ABC!=-1UPDATE [TABLE_NAME] SET XYZ=@ABC

Take a look at the MSDN docs.

Solution 2:

Another approach when you have many updates would be to use COALESCE:

UPDATE [DATABASE].[dbo].[TABLE_NAME]
SET    
    [ABC]  =COALESCE(@ABC, [ABC]),
    [ABCD] =COALESCE(@ABCD, [ABCD])

Solution 3:

Yet another approach is ISNULL().

UPDATE [DATABASE].[dbo].[TABLE_NAME]
SET    
    [ABC]  = ISNULL(@ABC, [ABC]),
    [ABCD] = ISNULL(@ABCD, [ABCD])

The difference between ISNULL and COALESCE is the return type. COALESCE can also take more than 2 arguments, and use the first that is not null. I.e.

selectCOALESCE(null, null, 1, 'two') --returns 1selectCOALESCE(null, null, null, 'two') --returns 'two'