SQL Delete Rows Based on Another Table

Question

This is probably very easy, but it\'s Monday morning. I have two tables:

Table1:

Field        | Type             | Null | Key | Default | Extra
id           


        

Answer 1

I think this way is faster:

DELETE FROM t1 USING table1 t1 INNER JOIN table2 t2 ON ( t1.group = t2.group );