How do I add a trigger to delete a row when a column reaches a certain value

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i am new to sql server . i am having problem to add a trigger to delete a record when the value of quantity column reaches zero .i am working with netbeans and sql server.

What I have tried:

i am new so i haven't tried anything yet.

Posted 14-Jul-16 20:11pm

Member 12636319

Updated 14-Jul-16 20:40pm

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Herman<T>.Instance 15-Jul-16 2:32am

Look HERE. Comes with explanation and examples.

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Sunasara Imdadhusen · Answer 1 · 2016-07-14T20:40:00

Hello,

Here is the solution to remove the rows from table when row count is reached to 12. this demo sample where we are maintaining users password in history (most recent 12 passwords) table for each users.

SQL

CREATE TRIGGER [dbo].[trgChangePassword] ON [dbo].[UserPassword] 
FOR INSERT
AS
	DECLARE @userid INT
	DECLARE @totalrec INT
	SELECT @userid = UserId FROM inserted
	SELECT @totalrec=COUNT(*) FROM UserPassword where UserId=@userid;
	IF @totalrec >= 12
	BEGIN 
		DELETE FROM UserPassword WHERE Id IN (SELECT TOP 1 Id FROM UserPassword WHERE UserId=@userid ORDER BY id ASC)
	End