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

Off the top of my head:

delete from Table1 where id in (select id from table1 inner join table2 on Table1.group = Table2.group)

I did this a little differently than other posters -- I think if there is a large number of rows on Table2 this might be better. Can someone please set me straight on that?