Hiw to fast delete rows from table in relation?

[Andrzej Borucki]

I have two tables:
general:
hash = primary key
code
other

detail:
hash+index = primary key
other

I want delete all rows from general where code=:code and from detail where general.hash=detail.hash
First job is easy:
delete from general where code=:code
Ho do second?

delete from detail where hash = select hash from general where code=:code
?

delete from detail left join general on detail.hash=general.hash where general.code = :code
?