Delete subtable from a table, SQL

What is the most clever way to delete tuples from table1, that are in the second table, if the second table is not a part of initial database, but a result of some really big query?

table1           *this table is a result of some query
-------------    -------------
| id1 | id2 |    | id1 | id2 |
-------------    -------------
| 1      2  |    | 5      6  |
| 3      4  |    | 1      2  |
| 5      6  |    | 11     12 |
| 7      8  |    -------------
| 9      10 |    
| 11     12 |
| 13     14 |
-------------

I came up with

delete from table1
where id1 in (select id1 from (         really long query to get a second table))
  and id2 in (select id2 from (the same really long query to get a second table));

It works, but I feel like I'm doing it way too wrong, and not keeping the query DRY.

And would the way you suggest work the same if table1 had an additional column, for example "somecol"?