Using instead of trigger

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November 29th, 2003, 04:36 AM

dmr999

Junior Member

Join Date: Nov 2003

Posts: 1

Time spent in forums: < 1 sec
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Using instead of trigger

Hi,

I'm trying to use a trigger to make sure no duplicates records would be added to my table (using sql server 2000). I've tried using the "instead of" trigger but for some reason it doen't work.

The code is :

Code:

CREATE TRIGGER tr_verifyDuplicates
ON tblAL
INSTEAD OF INSERT
AS
BEGIN  
  INSERT tblAL (column1,column2,column3)  
  SELECT column1,column2,column3   
  FROM INSERTED  
  WHERE NOT EXISTS  (
    SELECT * FROM tblAL     
    WHERE column1=(SELECT column1 FROM INSERTED)
    AND column2=(SELECT column2 FROM INSERTED)     
    AND column3=(SELECT column3 FROM INSERTED)
  )
END

I thought that the problem may be another column I have in the table which is an identity integer column (the table primary key-lets call it column0) but I don't know how to make it work.
The table has more than those 4 columns but all the other columns allow null values. Only the identity column and column2 which is a foreign key don't allow null.

Thanks for your help,
dmr

November 29th, 2003, 12:56 PM

swampBoogie

Contributing User

Dev Shed Intermediate (1500 - 1999 posts)

Join Date: Jan 2003

Location: Paris Uppland

Posts: 1,745

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define a unique or primary key constraint instead.

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