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when one column is updated, want to update another column in same table using trigger.


when one column is updated, want to update another column in same table using trigger.

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Joy Smith San
Joy Smith San
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Dear All,

I have a table in which there are fields like Quantity, Price, Total etc.There's is also a primary key field in this table.
We have an interface where user can change the quantity (only quantity).

I want to write a trigger on this table which calculates Total (qty * price) whenever qantity is updated.

How can I do it..?. How will I know for which row the quantity is updated..?

Pleas help...




Thanks in advance..
Santhosh Nair.
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Something similar to this?

CREATE TRIGGER dbo.trgMyTotalUpdate ON dbo.MyTable
AFTER UPDATE
AS

IF UPDATE(Quantity)
UPDATE mt
SET mt.Total = i.Quantity * i.Price
FROM dbo.MyTable AS mt
INNER JOIN inserted AS i ON i.PkCol = mt.PkCol




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Joy Smith San
Joy Smith San
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Thanks a lot...It's working...
Jerry Hung
Jerry Hung
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how about a Computed Column that "computes" i.Quantity * i.Price

http://www.sqlservercentral.com/articles/User-Defined+functions/complexcomputedcolumns/2397/

SQLServerNewbie

MCITP: Database Administrator SQL Server 2005
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