GROUP BY bug report

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               :       Giampiero Raschetti
Your email address      :       giampiero.raschetti@popso.it


System Configuration
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  Architecture (example: Intel Pentium)         :   Intel Pentium

  Operating System (example: Linux 2.0.26 ELF)  :   Linux 2.2.5-15 ELF
(REDHAT 6.0)

  PostgreSQL version (example: PostgreSQL-6.5.1):   PostgreSQL-6.5.1
(RPM version)

  Compiler used (example:  gcc 2.8.0)           :   gcc


Please enter a FULL description of your problem:
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GROUP BY fails to work, and SELECT DISTINCT too.


Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
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bash$ psql template1
template1=> CREATE TABLE "gruppi" ("id" int4 NOT NULL,"nome" character
varying(32));
CREATE
template1=> CREATE TABLE "usergroup" ("id" int4 NOT NULL,"uid" int4 NOT
NULL,"gid" int4 NOT NULL);
CREATE
template1=> insert into gruppi values (0,'ciao');
INSERT 31637 1
template1=> insert into gruppi values (1,'pippo');
INSERT 31638 1
template1=> insert into usergroup values (0,1,2);
INSERT 31639 1
template1=> insert into usergroup values (0,2,3);
INSERT 31640 1
template1=> insert into usergroup values (1,2,3);
INSERT 31641 1

And now the output query with GROUP BY:

template1=> SELECT g.nome,u.uid,u.id FROM gruppi g, usergroup u GROUP BY
g.nome;
ERROR:  Illegal use of aggregates or non-group column in target list
template1=> SELECT nome,id FROM gruppi GROUP BY nome;
ERROR:  Illegal use of aggregates or non-group column in target list

And now the output query with SELECT DISTINCT:

template1=> SELECT DISTINCT ON g.nome g.nome,u.uid,u.id from gruppi g,
usergroup u;
ERROR:  parser: parse error at or near "."


If you know how this problem might be fixed, list the solution below:
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NO ANS.