Thread: usernames of a group from SQL

Hi,

At the first time: I'm in newbie in SQL... I'm sorry!

My question is: How can I get the usernames of a group (for example 
'osztatlan_users') from SQL?

I try it:

SELECT usename
FROM pg_user
WHERE usesysid IN (SELECT grolist FROM pg_group WHERE 
groname='osztatlan_users')
ORDER BY pg_user;

But I get the next error message:

ERROR:  operator does not exist: oid = oid[]
HINT:  No operator matches the given name and argument type(s). You 
may need to add explicit type casts.

I see, what is the problem, but what can I do...?

Thans,
kjt


McAfee SCM 4.1 által ellenőrizve!

O Kis Jαnos Tamαs έγραψε στις May 19, 2006 :

> Hi,
> 
> At the first time: I'm in newbie in SQL... I'm sorry!
> 
> My question is: How can I get the usernames of a group (for example 
> 'osztatlan_users') from SQL?
> 
> I try it:
> 
> SELECT usename
> FROM pg_user
> WHERE usesysid IN (SELECT grolist FROM pg_group WHERE 
> groname='osztatlan_users')
> ORDER BY pg_user;
> 
> But I get the next error message:
> 
> ERROR:  operator does not exist: oid = oid[]
> HINT:  No operator matches the given name and argument type(s). You 
> may need to add explicit type casts.
> 
> I see, what is the problem, but what can I do...?

SELECT u.usename from pg_user u,pg_group g where u.usesysid = any 
(g.grolist) and g.groname='osztatlan_users';

> 
> Thans,
> kjt
> 
> 
> McAfee SCM 4.1 αltal ellenυrizve!
> 
> ---------------------------(end of broadcast)---------------------------TIP 4: Have you searched our list archives?
>                http://archives.postgresql.org
> 

-- 
-Achilleus

On Friday May 19 2006 12.04, Achilleus Mantzios wrote:
>
> SELECT u.usename from pg_user u,pg_group g where u.usesysid = any
> (g.grolist) and g.groname='osztatlan_users';
>

I'd like to make a function with this SQL:

CREATE FUNCTION kodok.group_users(group_name "varchar")
RETURNS SETOF "varchar" AS
$BODY$
SELECT pg_user.usename
FROM pg_user, pg_group
WHERE usesysid = any (pg_group.grolist) AND pg_group.groname=$1;
$BODY$
LANGUAGE 'sql' VOLATILE;

But I get the next error message:

ERROR:  return type mismatch in function declared to return character 
varying
DETAIL:  Actual return type is name.
CONTEXT:  SQL function "group_users"

At the moment, I don't understand what is the problem, and what I need 
to do now...?

Thanks,
kjt

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Hi, Kijato,

kijato schrieb:

> CREATE FUNCTION kodok.group_users(group_name "varchar")
> RETURNS SETOF "varchar" AS
> $BODY$
> SELECT pg_user.usename
> FROM pg_user, pg_group
> WHERE usesysid = any (pg_group.grolist) AND pg_group.groname=$1;
> $BODY$
> LANGUAGE 'sql' VOLATILE;

The pg_user.username column uses the PostgreSQL internal type "name"
which is used for identifiers like table and user names. The PostgreSQL
Documentation contains more about this.

I think you can cast it to varchar, like:

SELECT pg_user.username::varchar


HTH,
Markus