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SQL 2008 Update Trigger

Posted on 2010-08-15
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Last Modified: 2012-05-10

I need to make a trigger that updates only rows that have changed

Table 1 Columns
ID, GroupGameID

Table 2 Columns
ID, GroupGameID


The 2 tables are matched by ID.. I need to trigger to update GroupGameID value in table 2 with changed value in table 1
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Question by:Leo Torres
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6 Comments
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 33440883
ltorres321,

You can use the DELETED and INSERTED tables to compare the values to tell when there has actually been a change to the GroupGameID field. You can also in newer versions of SQL use IF UPDATE(GroupGameID).
CREATE TRIGGER trg_Tbl1_UpdateTbl2
ON Tbl1
FOR UPDATE
AS
IF UPDATE(GroupGameID)
BEGIN
   UPDATE tto
   SET tto.GroupGameID = tfr.GroupGameID
   FROM Tbl2 tto
   INNER JOIN inserted tfr
      ON tfr.ID = tto.ID;
END
GO

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LVL 8

Author Comment

by:Leo Torres
ID: 33441175
Got this error

Msg 207, Level 16, State 1, Procedure tr_CreateGameDetail, Line 57
Invalid column name 'GameID'.

Not sure how insert is supposed to work here if this is supposed to be an update

 IF (UPDATE (GroupGameID))
   BEGIN
      UPDATE 
         dbo.GI_PlayerGameDetail 
	SET	pd.GroupGameID = i.GroupGameID
		FROM dbo.GI_PlayerGameDetail pd
		INNER JOIN inserted i
			ON i.GameID = pd.GameID

		End		

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LVL 59

Accepted Solution

by:
Kevin Cross earned 500 total points
ID: 33441317
Is there an actual GameID column ? You said ID before.
IF (UPDATE (GroupGameID))
BEGIN
   UPDATE pd
   SET pd.GroupGameID = i.GroupGameID
   FROM dbo.GI_PlayerGameDetail pd
   INNER JOIN inserted i
      ON i.ID = pd.ID -- use proper ID columns here
END

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LVL 8

Author Comment

by:Leo Torres
ID: 33441358
Actually the actual Column is GameID i just used ID for the question
I am getting the error on line 8
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LVL 8

Author Comment

by:Leo Torres
ID: 33441581
Got thanks, FYI it was a the link one of the fields was NULL and no match was being made.. Thanks
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LVL 59

Expert Comment

by:Kevin Cross
ID: 33441604
Glad you got it and I could help.

Best regards and happy coding,
Kevin
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