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create table mytable(id int, received_by int, sent_by int, amount int, product_id int); insert into mytable values(1, 1, 2, 10, 1); insert into mytable values(2, 1, 3, 12, 1); insert into mytable values(3, 2, 1, 5, 1); insert into mytable values(4, 3, 1, 8, 2);
select product_id, (coalesce(received,0)-coalesce(sent,0)) as Quantity, coalesce(received,0) received,coalesce(sent)sent from ( select product_id, sum(case when received_by = 1 then amount end) as received, sum(case when sent_by = 1 then amount end) as sent from mytable group by product_id )t;
product_id
Quantity
received
sent
1
17
22
5
2
-8
0
8