Zkuste to takto:
select
(
SELECT
"count"(*) as val1
from
tab1
) - (
SELECT
"count"(*) as val2
from
tab2
) as total_count
Zkuste to takto:
select
(
SELECT
"count"(*) as val1
from
tab1
) - (
SELECT
"count"(*) as val2
from
tab2
) as total_count