Question

I have two tables, TableA and TableB, and each has a field called ID.

I want to delete all the records in TableA where the ID matches a record in TableB.

I try to do this command, but TableB is not found

DELETE FROM TableA WHERE TableA.id=TableB.id;

Answer 1

You can’t reference TableB on WHERE because that table was not joined. But on this case you don’t even need a JOIN, use this:

DELETE FROM TableA WHERE id IN (SELECT id FROM TableB)