Re: sql help

but after all

SELECT DISTINCT ON (system.name, clust.clust) clust.clust where
clust.clust_id = clust_sys.clust_key
and
clust_sys.sys_key = system.key_system
and
system.location_key = 61 order by system.name

was what i really wanted

thanx anyway, next time i should just read the error.

-----Original Message-----
From: Duncan Adams (DNS) [mailto:duncan(dot)adams(at)vcontractor(dot)co(dot)za]
Sent: Tuesday, December 11, 2001 10:36 AM
To: pgsql-novice(at)postgresql(dot)org
Subject: [NOVICE] sql help

hi all

is there any way of getting around this problem?

SELECT DISTINCT ON (clust.clust) clust.clust where
clust.clust_id = clust_sys.clust_key
and
clust_sys.sys_key = system.key_system
and
system.location_key = 61
order by system.name;

ERROR: SELECT DISTINCT ON expressions must match initial ORDER BY
expressions

would one create a view or perhaps a temp table, and then do a second query
on that.
although i would prefer to just have one SQL statement.
the system.name will always be unique. there will normally be a number of
systems belonging to the cluster in clust.clust.

thanx
duncan.

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