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CREATE TABLE stock_in ( product_id int, quantity_in int ); insert into stock_in values (1,15), (1,5), (2,5), (2,10), (3,15), (4,5); CREATE TABLE stock_out ( product_id int, quantity_out int ); insert into stock_out values (1,7), (2,3), (3,5), (2,2), (1,8), (2,2), (1,5), (3,3);
select t1.product_id,case when tot_quantity_out is null then tot_quantity_in else tot_quantity_in - tot_quantity_out end as InStock from ( select product_id,sum(quantity_in) as tot_quantity_in from stock_in group by product_id ) as t1 left join ( select product_id,sum(quantity_out) as tot_quantity_out from stock_out group by product_id ) as t2 on t1.product_id=t2.product_id;
product_id
InStock
1
0
2
8
3
7
4
5