if you want to get single value from each table like sum or count of a column then you can do this like-
select
(
(select count(*) from table 1) A,
(select count(*) from table 2) B,
(select count(*) from table 3)C,
(select count(*) from table 4) D
)
It will give the Single row with 4 columns named A,B,C and D