I'm trying to
select a,count(1) FROM (select a from X UNION select a from Y ) group by a;
but it complains and says that the subquery must have an alias and I
have not figured it out how to add that.
Btw. is there any other way of doing what I'm doing above?
It's basically select a,count(1) from X group by a + select
a,count(1) from Y group by a where "+" means they should be summed
on the "a" field.
I tried
select a,sum(b) from ( select a,count(1) as b from X group by a
union select a,count(1) as b from Y group by a) group by a
but that gave also an error asking for an alias for the subquery.
How can I solv this problem?
