What is the syntax for a delete with a join in HANA?

Hi Everyone

I read the previous answer to this question which was:

deletefrom sk1

where (sk1.user, sk1.location) in (select sk.user, sk.location from sk);

unfortunately this does a select for every key in the table.  I have to delete 1.3b rows from a 2b row table...

even HANA takes too long to run 1.3b selects...

How do we actually do a join with a delete????

Thanks

Doug