Executing a stored procedure as a result of merge statement - sql

Question

I am using a MERGE statement in a stored procedure that looks like this:
MERGE Sections AS sTarget
USING #Sections AS sSource
ON sTarget.SectionID = sSource.SectionID
WHEN NOT MATCHED THEN
<INSERT STATEMENT>
WHEN MATCHED THEN
UPDATE SET
IsActive = CASE WHEN sSource.IsDeleted = 1 THEN 0 ELSE 1 END;
^
A
Where #Sections is a parameter passed to the stored procedure.
Now I want to execute a stored procedure called spDeleteSection that accepts SectionID as a parameter and (soft) deletes all the divisions and subdivisions under the section and returns 0. I want to execute this procedure at 'A'.
Can this be done? If so how? If it cannot be done where am I supposed to execute this to get the same result?
Note :
#Sections is a user defined table
SectionID is obtained form sSource.SectionID

Answer 1

You can capture each merged row using an OUTPUT clause into a table variable.
Then simply join that table in a DELETE.
Do not be tempted to execute something row-by-row over this table variable, it's likely to be slow. Do a single joined delete.
DECLARE #output TABLE (SectionID int PRIMARY KEY, action nvarchar(10))
MERGE Sections AS sTarget
USING #Sections AS sSource
ON sTarget.SectionID = sSource.SectionID
WHEN NOT MATCHED THEN
<INSERT STATEMENT>
WHEN MATCHED THEN
UPDATE SET
IsActive = CASE WHEN sSource.IsDeleted = 1 THEN 0 ELSE 1 END
OUTPUT sTarget.SectionID, $action
INTO #output (SectionID, action);
;
DELETE d
FROM Division d
JOIN #output o ON o.SectionID = d.SectionID
WHERE o.action = 'UPDATE';
If necessary, you can dump the correct rows from this table variable into a Table Valued Parameter and execute a separate procedure with that.