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MSSQL Trigger On Same Table

Posted on 2014-02-20
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Last Modified: 2014-02-20
Hello...

We have a table called "SY_WRKGRP", with a Primary Key on Field "WRKGRP_ID".  Within that table, there's a field called "NXT_ITEM_NO".

When a value is UPDATED on the "NXT_ITEM_NO" field, for *any* of the WRKGRP_ID's, we want/need the value of "NXT_ITEM_NO" to be updated with that same value...for all other WRKGRP_ID's.

We were having a issue with the Syntax, as it seems we're (somehow?) looping the originating WRKGRP_ID onto itself.  Please help...something's obviously amuck :-)

Thanks!...Mark
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Question by:datatechcorp
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LVL 70

Expert Comment

by:Scott Pletcher
ID: 39875071
That doesn't really make sense to me.  Instead of updating every row, why not just put the NXT_ITEM_NO into a separate table?
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Author Comment

by:datatechcorp
ID: 39875131
...because we cannot alter the Table Structure...we simply need "consistency" amongst the data field...once they are populated/updated (there's business logic behind all this).

I hope this helps...Thanks!...Mark
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LVL 70

Expert Comment

by:Scott Pletcher
ID: 39875142
UPDATE SY_WRKGRP
SET NXT_ITEM_NO = (
    SELECT TOP (1) NXT_ITEM_NO
    FROM inserted
    ORDER BY WRKGRP_ID DESC
    )


Not sure about the "onto itself" part ... updating the originally changed WRKGRP_ID row with the value from that row shouldn't really change the data.
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Author Comment

by:datatechcorp
ID: 39875176
Hi Scott...

It was suggested that we needed a 'NOCOUNT' instruction added in there somewhere...does that make sense?  Please let me know...Thanks!...Mark
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LVL 70

Accepted Solution

by:
Scott Pletcher earned 2000 total points
ID: 39875308
Yes, that does indeed make sense, and it's quite true:

CREATE TRIGGER SY_WRKGRP__TRG
ON SY_WRKGRP
AFTER UPDATE --, INSERT
AS
SET NOCOUNT ON
UPDATE SY_WRKGRP
SET NXT_ITEM_NO = (
    SELECT TOP (1) NXT_ITEM_NO
    FROM inserted
    ORDER BY WRKGRP_ID DESC
    )
GO
0
 

Author Closing Comment

by:datatechcorp
ID: 39875330
Scott...thank you soooo much!  It's very appreciated!...Thanks!...Mark
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