My bad. Within the original SQL, the sub-select summed a column aliased
to an outside table. From Vlad's example, my mistake would have been
represented by:

SELECT SUM(D1.RDB$RELATION_ID -
(SELECT
SUM(D1.RDB$RELATION_ID) <-- should be D2, not D1!
FROM RDB$DATABASE D2))
FROM RDB$DATABASE D1

-----Original Message-----
From: firebird-support@yahoogroups.com
[mailto:firebird-support@yahoogroups.com] On Behalf Of Vlad Horsun
Sent: Thursday, February 22, 2007 11:41 AM
To: firebird-support@yahoogroups.com
Subject: Re: [firebird-support] Nested aggregate functions

> This statement is not (returns 'Nested aggregate functions are not
> allowed'):
>
> SELECT
> SUM(t1.COL1 - (SELECT SUM(t2.COL1) FROM TABLE2 t2 WHERE t2.COL2 =
> ?)) FROM
> TABLE1 t1
>
> In both cases the SELECT on TABLE2 is standalone, and does not require

> any nested aggregation on the original stream.

SELECT SUM(D1.RDB$RELATION_ID -
(SELECT SUM(D2.RDB$RELATION_ID)
FROM RDB$DATABASE D2))
FROM RDB$DATABASE D1

worked fine even in FB 1.5.2

Regards,
Vlad


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