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create temporary table enq (id INT, name char(10)); create temporary table rep (id int, enq_id int, from_user int, to_user int, msg char(10)); insert into enq values (1, 'sample'); insert into rep values (1, 1, 1, 2, 'msg1'); insert into rep values (2, 1, 2, 1, 'msg2'); insert into rep values (3, 1, 1, 2, 'msg3'); insert into rep values (4, 1, 2, 1, 'msg4'); insert into rep values (5, 1, 1, 3, 'msg1'); insert into rep values (6, 1, 3, 1, 'msg2'); select * from rep; select enq_id, from_user, to_user, count(1) msg from rep group by enq_id, from_user, to_user order by id
absolute service time: 0,32 sec
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id
enq_id
from_user
to_user
msg
1
1
1
1
2
msg1
2
2
1
2
1
msg2
3
3
1
1
2
msg3
4
4
1
2
1
msg4
5
5
1
1
3
msg1
6
6
1
3
1
msg2
enq_id
from_user
to_user
msg
1
1
1
2
2
2
1
2
1
2
3
1
1
3
1
4
1
3
1
1