'GROUP BY' / 'DISTINCT' interaction bug?
Started by Mark Hollomonover 25 years ago2 messages
Is this a known problem? Is there a work-around?
create table t (c char, i int);
insert into t values ('a', 1);
insert into t values ('a', 1);
insert into t values ('a', 2);
insert into t values ('b', 2);
select distinct on (c, i) c, count(i) from t group by c;
ERROR: Attribute t.i must be GROUPed or used in an aggregate function
--
Mark Hollomon
mhh@nortelnetworks.com
ESN 451-9008 (302)454-9008
Re: 'GROUP BY' / 'DISTINCT' interaction bug?
"Mark Hollomon" <mhh@nortelnetworks.com> writes:
select distinct on (c, i) c, count(i) from t group by c;
ERROR: Attribute t.i must be GROUPed or used in an aggregate function
Why do you think that's a bug? The DISTINCT clause requires use of
the ungrouped value of i, doesn't it?
regards, tom lane