Use of GROUP BY

Only attribute in SELECT-clause that are not used in aggregation must be
included in GROUP BY clause. So, if you had smth like:
select field1, sum(amount) from table1 where field1 = 1234 GROUP BY
field1;
You would have to include GROUP BY field 1 as shown above.
In your case, it would just sum up all the amount values in your table.

-----Original Message-----
From: Mihai Gheorghiu [mailto:tanethq@earthlink.net]
Sent: Wednesday, October 02, 2002 2:42 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] Use of GROUP BY

PG7.2.1 on RH7.3
There is no 1234 value in field1.
select sum(amount) from table1 where field1 = 1234;
sum
-----

(1 row)

select sum(amount) from table1 where field1 = 1234 group by field1; sum
-----
(0 rows)

If GROUP BY should always be used in statements using aggregate
functions, why don't I get an error?

Thank you all.

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