Question

I have the following Merge statement I’m working with:

    MERGE dbo.UnitOfMeasure AS target
    USING (
        SELECT * FROM dbo.UnitOfMeasure
    ) AS src
    ON 
        target.UOMId = src.UOMId
    WHEN NOT MATCHED THEN           
        INSERT 
            (
                UOMId,
                UOM
            )  
        VALUES 
            (
                src.UOMId,
                src.UOM
            )
    WHEN NOT MATCHED BY SOURCE THEN 
        DELETE    <-- Do something other than delete here
    WHEN MATCHED THEN
        UPDATE SET 
            target.UOM = src.UOM;

Instead of actually deleting the records, I’d like to run a stored procedure for each record that was going to be deleted. In essence, I can’t simply delete these records. Instead, I have stored procedure that handles the deleting for me. I just need to pass in the unique ID (UOMId) to the stored proc.

Anyone know of way to do this using the Merge statement?

Thanks!

Answer 1

If I read the documentation correctly, it appears that the only options available to you from with the WHEN NOT MATCHED BY SOURCE clause are UPDATE and DELETE: http://technet.microsoft.com/en-us/library/bb510625.aspx.

Lame! Executing a procedure would be endlessly useful here! Even an INSERT would be sufficient for most scenarios…

Nevertheless, in your case, I would process these records in two steps. 1: Use MERGE with an UPDATE statement to flag the fields to be deleted. 2: Call your deletion code on the flagged fields.

Good luck!