-- { echo }
select exists(select 1);
1
select exists(select 1 except select 1);
0
select exists(select number from numbers(10) where number > 0);
1
select exists(select number from numbers(10) where number < 0);
0
select count() from numbers(10) where exists(select 1 except select 1);
0
select count() from numbers(10) where exists(select 1 intersect select 1);
10
select count() from numbers(10) where exists(select number from numbers(10) where number > 8);
10
select count() from numbers(10) where exists(select number from numbers(10) where number > 9);
0