Question

I have two tables that I can perfectly query seperately.

table1 stores ranges:

SELECT range_id, range_from, range_to FROM table1;

table2 stores IDs:

SELECT MAX(id) FROM table2 WHERE id BETWEEN <x> AND <y>;

I need a query that for each tuple (range_id, from, to) from table1 selects the MAX(id) from table2 such that MAX(id) is between from and to:

range_id    max(id)
--------    -------
foo         3
bar         17
snafu       823467

I don’t see how to accomplish this, since there’s nothing to JOIN here.

Any ideas?

Answer 1

select  *
,       (
        select  max(t2.id)
        from    table2 t2
        where   t2.id between t1.range_from and t1.range_to
        ) as max_id_in_range
from    table1 t1