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delete a record that has a foreign key

Posted on 2014-12-15
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Last Modified: 2014-12-16
I have the following SQL JOIN statement

select * from tblOrgGoals G
Inner Join tblOrgObjectives O on G.GoalID = O.GoalID
Inner Join tblOrgPI P on O.ObjectiveID = P.ObjectiveID

If I would like to delete a record from tblOrgGoals and it is linked to the other two tables, how would I be able to cascade delete all the records that record has a relationship with?

Can I also delete a record from tblOrgPI and cascade delete in the other direction?
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Question by:al4629740
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Jim Horn earned 2000 total points
ID: 40501038
Assuming you know the GoalID (42 here), you could delete the row(s) from the related table, then the goal table.  
All in a transaction so the set of deletes succeed or fail together.
BEGIN TRY
  BEGIN TRAN tr

  DELETE P
  FROM tblOrgPI P
     Join tblOrgObjectives O ON O.ObjectiveID = P.ObjectiveID
  WHERE O.GoalID = 42

  DELETE O
  FROM tblOrgObjectives O
  WHERE O.GoalID = 42

  DELETE FROM tblOrgGoals WHERE GoalID=42 

  -- If code execution makes it here, good to go
  COMMIT TRAN tr
END TRY

BEGIN CATCH
  -- Ruh roh.  An error occured. 
  PRINT 'An error occured'
  ROLLBACK TRAN tr
END CATCH

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