Question

How can I delete a specific row on a table only if its data is not used by another table anymore?

Lets say I have a [schedule] table and [scheduletype] table. If a specific [scheduletype] is not found in [schedule].[type] field of the [schedule] table then it will be removed from the [scheduletype] table.

BTW I am using SQL Server 2005.

Answer 1

Try this (assuming the relevant field is called id in schedule):

DELETE FROM scheduletype WHERE id NOT IN (select a.type FROM schedule a)