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Help on trigger

Author

Topic

Ciupaz
Posting Yak Master

232 Posts

Posted - 2011-09-21 : 02:53:18

Hi all,
I have a table "Products" like this one:

ProductID - Price - OtherColumn

with some values

23 - 34.99
24 - 15.90
12 - 120.00
5 - 34.00
32 - 35.90
.....

How can I write a trigger that updates automatically this table when someone or something make an Insert or Update to set the Price field = 0 when its value is negative, and this *only* for ProductID = 32?

Thanks in advance.

Luigi

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2011-09-21 : 05:43:22

[code]
CREATE TRIGGER UpdatePrice
ON Products
FOR INSERT,UPDATE
AS
BEGIN
UPDATE t
SET t.Price=0
FROM Products t
INNER JOIN INSERTED i
ON i.ProductID = t.ProductID
AND i.ProductID =32
WHERE i.Price < 0
END
[/code]

I would have done this by means of check constraint though to avoid this insert/update first off all.

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

Ciupaz
Posting Yak Master

232 Posts

Posted - 2011-09-21 : 08:03:39

Perfect, thank you Visakh.

Luigi

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2011-09-21 : 08:47:27

welcome

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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