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Posted by Erland Sommarskog on 10/02/24 11:51
jazpar (jannoergaard@hotmail.com) writes:
> I have a table - DebtorTurnover - consisting of 5 fields (ID, Date,
> Turnover, VAT, Netturnover). I get a file which I have to import every
> know and then, with new data. In this file I only get values for (ID,
> Date, Turnover and VAT). The import is working fine with the import
> wizard.
>
> The problem is, that I want to have the Netturnover computed at the
> time of insert to equal [Turnover-VAT], but I don't really know how to
> as I'm new to these triggers.
The simplest is to make NetTurnover a computed column:
CREATE TABLE DebtorTurnover
(ID int NOT NULL,
Date datetime NOT NULL,
Turnover decimal(10,2) NOT NULL,
VAT decimal(10, 2) NOT NULL,
Netturnover AS Turnover - VAT)
A trigger would look like this:
CREATE TRIGGER DebtorTurnover_tri ON DebtorTurnover
FOR INSERT, UPDATE AS
UPDATE DebtorTurnover
SET Netturnover = dt.Turnover - dt.VAT
FROM DebtorTurnover dt
WHERE EXISTS (SELECT *
FROM inserted dt
WHERE dt.ID = i.ID
The "inserted" table is a virtual table that holds the inserted rows,
or in case of an UPDATE, the update rows after the table.
--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
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