From: ww zz <ts_999@yahoo.com>
To: pgsql-sql@postgresql.org
Subject: how to do this query?
Date: Tue, 20 May 2003 09:00:11 -0700 (PDT)
Message-ID: <20030520160011.81254.qmail@web41803.mail.yahoo.com> (raw)
New to sql and may be a simple question for you:
I have four tables
sample: sid, sname
make: sid, mdate
measure: sid, mdate, rid
result: rid, resultdata
for a gaven sample it always has a sid and sname, but
it may or may not have any entries in the other
tables, the sample could be measured more than once
and each measure give a result row.
question:
how do I do a query that given a sid, it will retrieve
all the information available in the four tables, if
there are available. If, for example, all tables have
some entry for a gave sample it will retreve all the
information, if the "measure" and "result" are empty
for that sample it will give only the 'sample' and
'make' information....
please help
Thanks
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