I'm interested in finding the minimim A.id such that the following holds:
select A.charge
, B.user_id
, C.employee_id
from A
inner join B using (user_id)
inner join C using (employee_id)
except
select X.charge
, Y.user_id
, Z.employee_id
from X
inner join Y using (user_id)
inner join Z using (employee_id)
--
I can't do the following, since the number of selected columns have to match:
select A.id
, A.charge
, B.user_id
, C.employee_id
from A
inner join B using (user_id)
inner join C using (employee_id)
except
select X.charge
, Y.user_id
, Z.employee_id
from X
inner join Y using (user_id)
inner join Z using (employee_id)
Can someone help me with the query?
Thanks in advance.
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
