Does a transaction automatically rollback on error?

When I write code for a multiple statements transaction do I need to check'if @.@.ERROR > 0 ' after each SELECT, INSERT, DELETE or UPDATE statement so that the'rollback tran' statement can be given, or SQL server will automatically rollback the transaction and we don't need to check for @.ERROR > 0 ?

If you start a transaction (with BEGIN TRANSACTION) you must end it with a COMMIT or ROLLBACK. So, yes, you should check the @.@.ERROR value after each pertinent statement and explicitly ROLLBACK the transaction if there is an error. I am not sure if there were any changes in this area for SQL Server 2005.|||In SQL 2005, you could do:

BEGIN TRY
.....
COMMIT
END TRY
BEGIN CATCH
.....
ROLLBACK
END CATCH

The good thing is you could put multiple SQL statementsin the TRY block. But there are some limitations too. check out books on line.