Apparently the ordering of columns affects the applicability of
GROUP BY for INSERT:
<pkp@cooloola> createdb pkptest
<pkp@cooloola> psql pkptest
Welcome to the POSTGRESQL interactive sql monitor:
Please read the file COPYRIGHT for copyright terms of POSTGRESQL
type \? for help on slash commands
type \q to quit
type \g or terminate with semicolon to execute query
You are currently connected to the database: pkptest
pkptest=> CREATE TABLE a_foo (a_Index int4,
pkptest-> bar int4);
CREATE
pkptest=> INSERT INTO a_foo
pkptest-> VALUES (1, 1);
INSERT 253866 1
pkptest=> INSERT INTO a_foo
pkptest-> VALUES (1, 2);
INSERT 253867 1
pkptest=> INSERT INTO a_foo
pkptest-> VALUES (2, 1);
INSERT 253868 1
pkptest=> CREATE TABLE b_foo (a_Index int4,
pkptest-> count int4);
CREATE
pkptest=> INSERT INTO b_foo
pkptest-> SELECT a_Index, COUNT(*)
pkptest-> FROM a_foo
pkptest-> GROUP BY a_Index;
INSERT 0 2
pkptest=> SELECT * FROM b_foo;
a_index|count
-------+-----
1| 2
2| 1
(2 rows)
--------- Now try again with columns reversed in b_foo ---------
pkptest=> DELETE FROM b_foo;
DELETE 2
pkptest=> DROP TABLE b_foo;
DROP
pkptest=> CREATE TABLE b_foo (count int4,
pkptest-> a_Index int4);
CREATE
pkptest=> INSERT INTO b_foo
pkptest-> SELECT COUNT(*), a_Index
pkptest-> FROM a_foo
pkptest-> GROUP BY a_Index;
ERROR: parser: aggregates not allowed in GROUP BY clause
cheers
Pushkar
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