Hi everybody,
suppose you have a large table tab and two (or more) queryes like this:
SELECT count(*),A FROM tab WHERE C GROUP BY A;
SELECT count(*),B FROM tab WHERE C GROUP BY B;
is there any way to get both results in a single query,
eventually through stored procedure?
The retrieved [count(*),A] ; [count(*),B)] data couldnt fit
on a single table, of course.
The main goal would be to get multiple results while scanning the
table[s] once only
thus getting results in a faster way.
This seems to me quite a common situation but i have no clue whether a neat
solution can be implemented through stored procedure.
Any hint?
Thank you
Stefano
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
