By looking at other examples I've come up with the following but it doesn't seem to work as I would like: I want it to only update the modified information if the QtyToRepair
value has been updated... but it doesn't do that.
If I comment out the where then the modified information is updated in every case. As I said other examples led me to be optimistic. Any clues appreciated. Thanks.
Walter
ALTER TRIGGER [dbo].[tr_SCHEDULE_Modified]
ON [dbo].[SCHEDULE]
AFTER UPDATE
AS
BEGIN
SET NOCOUNT ON;
UPDATE SCHEDULE SET modified = GETDATE()
, ModifiedUser = SUSER_NAME()
, ModifiedHost = HOST_NAME()
FROM SCHEDULE S
INNER JOIN Inserted I on S.OrderNo = I.OrderNo and S.PartNumber = I.PartNumber
WHERE S.QtyToRepair <> I.QtyToRepair
END
You have two way for your question :
1- Use Update Command in your Trigger.
ALTER TRIGGER [dbo].[tr_SCHEDULE_Modified]
ON [dbo].[SCHEDULE]
AFTER UPDATE
AS BEGIN
SET NOCOUNT ON;
IF UPDATE (QtyToRepair)
BEGIN
UPDATE SCHEDULE
SET modified = GETDATE()
, ModifiedUser = SUSER_NAME()
, ModifiedHost = HOST_NAME()
FROM SCHEDULE S INNER JOIN Inserted I
ON S.OrderNo = I.OrderNo and S.PartNumber = I.PartNumber
WHERE S.QtyToRepair <> I.QtyToRepair
END
END
2- Use Join between Inserted table and deleted table
ALTER TRIGGER [dbo].[tr_SCHEDULE_Modified]
ON [dbo].[SCHEDULE]
AFTER UPDATE
AS BEGIN
SET NOCOUNT ON;
UPDATE SCHEDULE
SET modified = GETDATE()
, ModifiedUser = SUSER_NAME()
, ModifiedHost = HOST_NAME()
FROM SCHEDULE S
INNER JOIN Inserted I ON S.OrderNo = I.OrderNo and S.PartNumber = I.PartNumber
INNER JOIN Deleted D ON S.OrderNo = D.OrderNo and S.PartNumber = D.PartNumber
WHERE S.QtyToRepair <> I.QtyToRepair
AND D.QtyToRepair <> I.QtyToRepair
END
When you use update command for table SCHEDULE
and Set QtyToRepair
Column to new value, if new value equal to old value in one or multi row, solution 1 update all updated row in Schedule table but solution 2 update only schedule rows that old value not equal to new value.