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create table a (tstamp timestamp, weight int, destination varchar(100)); create table b (tstamp timestamp, weight int, destination varchar(100)); insert into a values ('2020-01-01 10:00:00', 40, 'germany'), ('2019-01-01 10:00:00', 50, 'germany'), ('2020-04-01 10:00:00', 10, 'germany'), ('2019-04-01 10:00:00', 20, 'germany'), ('2020-01-01 11:00:00', 40, 'congo'), ('2019-01-01 11:00:00', 50, 'congo'), ('2020-04-01 11:00:00', 10, 'congo'), ('2019-04-01 12:00:00', 20, 'congo'); insert into b values ('2020-01-01 10:00:00', 40, 'germany'), ('2019-01-01 10:00:00', 50, 'germany'), ('2020-04-01 11:00:00', 10, 'congo'), ('2019-04-01 11:00:00', 20, 'congo'); select sum(case when source = 'a' then counter else 0 end) as count_a, sum(case when source = 'b' then counter else 0 end) as count_b, sum(counter) as counter_a_b from ( select count(*) as counter, 'a' as source from a where destination = 'germany' and hour(tstamp) = 10 union all select count(*) as counter, 'b' as source from b where destination = 'germany' and hour(tstamp) = 10 ) t
count_a
count_b
counter_a_b
4
2
6