Sql trigger to update second table field

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I wanted to create a trigger after update , I have 2 tables Buytable and Selltable both have same fields (id,transId,symbol,qty,date,transtype), I want to update the buytable transtype every time i update only the selltable transtype which is (true, false) for only the same transid on both table

i have tried the below cod but its not working, pls help

Alter trigger [dbo].[transtypr_Update] on [dbo].[SellTable]

What I have tried:

Create trigger [dbo].[transtypr_Update] on [dbo].[SellTable] 
 
AFTER UPDATE

AS


IF UPDATE(TransType)

begin


declare @TransType as Bit
declare @Buy_TransID as Int
declare @Sell_TransID as Int
declare @Type as Bit



select @TransType= TransType from BuyTable
select @Sell_TransID= TransID from SellTable
select @Buy_TransID= TransID from BuyTable
select @Type= TransType from SellTable



UPDATE [dbo].[BuyTable]

set [TransType]  = @Type 
where @Buy_TransID=@Sell_TransID
end

Posted 17-Jan-20 19:50pm

qulaitks

Updated 17-Jan-20 20:15pm

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OriginalGriff 18-Jan-20 1:57am

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Wendelius · Answer 1 · 2020-01-17T20:16:00

Solution 1

To fetch the updated data you need to use Inserted table. So the trigger would be something like

SQL

CREATE TRIGGER [dbo].[transtypr_Update] on [dbo].[SellTable] 
AFTER UPDATE AS
BEGIN
   IF UPDATE(TransType) BEGIN
      UPDATE BuyTable
      SET    BuyTable.TransType = inserted.TransType
      FROM   BuyTable
      INNER JOIN Inserted ON BuyTable.TransID = Inserted.TransID
   END
END

Posted 17-Jan-20 20:16pm

Wendelius

Comments

qulaitks 18-Jan-20 3:52am

Thanks it works .

Wendelius 18-Jan-20 4:47am

You're welcome.