Question

The below query returns me two rows:

SELECT 
DocList.DocListId, RegistrationDocList.RegistrationDocListId, Registration.RegistrationId 
FROM 
DocList INNER JOIN
RegistrationDocList ON DocList.DocListId = RegistrationDocList.DocListId INNER JOIN
Registration ON RegistrationDocList.RegistrationId = Registration.RegistrationId
WHERE (DocList.DocListId = 547)

Results:

--------------------------------------------------------
DocListId   RegistrationDocListId    RegistrationId
-------------------------------------------------------
547              097                     115
547              098                     116

UPDATE:

as you can see its using three tables, so i want to delete the rows from:

DocList where doclistid = 547
RegistrationDocList.RegistrationId  where RegistrationId in (097,098)
Registration.RegistrationId  where RegistrationId in (115,116)

Answer 1

You need to cache the values to delete on the far side of the link table, delete the link records, and then delete the linked records:

DECLARE @reg_to_delete TABLE (id int)

INSERT INTO @reg_to_delete (id)
SELECT RegistrationID FROM RegistrationDocList WHERE DocListID = 547

DELETE FROM RegistrationDocList WHERE DocListID = 547

DELETE FROM RegistrationList WHERE RegistrationID IN (SELECT id FROM @reg_to_delete)

DELETE FROM DocList WHERE DocListID = 547