Question

I have a trigger but when it tries to run I get

The Row values(s) updated or deleted either do not make the row unique…

I want to update a table when the col REDEEMED in the triggered table is updated.

What do I need to change in my trigger to make this work?

Table GeneratedCouponCounter:

    Id int (primary key)
    CouponId int
    NrOfRedeemedCoupons int
    NrOfGeneratedCoupons int
    LastGenerated datetime
    LastRedeemed datetime
    CreatedOn datetime

Trigger:

CREATE TRIGGER trigger_update
ON GeneratedCoupon2
AFTER UPDATE
AS
    IF( UPDATE(REDEEMED))
    begin        
        update GeneratedCouponCounter
        SET NrOfRedeemedCoupons = NrOfRedeemedCoupons +1,[LastRedeemedOn] = getdate()
        where CouponId IN (SELECT CouponID from INSERTED)
    end

Thanx!

/Mike

Answer 1

Create PRIMARY KEY on GeneratedCoupon2 table, also the WHERE part of update will case errors when you update more than one record on ‘GeneratedCoupon2’ table. Change it to:
where CouponId IN (SELECT CouponID from INSERTED)

EDIT:
Changed table name where KEY is needed to reflect fix to the problem.