From: Gary Stainburn <gary.stainburn@ringways.co.uk>
To: Philip Warner <pjw@rhyme.com.au>
To: pgsql-sql@postgresql.org
Subject: Re: Help on (sub)-select
Date: Fri, 20 Dec 2002 11:48:24 +0000
Message-ID: <200212201148.24013.gary.stainburn@ringways.co.uk> (raw)
In-Reply-To: <5.1.0.14.0.20021220214822.02d7e360@mail.rhyme.com.au>
References: <5.1.0.14.0.20021220214822.02d7e360@mail.rhyme.com.au>
On Friday 20 Dec 2002 10:51 am, Philip Warner wrote:
> At 10:21 AM 20/12/2002 +0000, Gary Stainburn wrote:
> >nymr=# select r.*, s.tally from roster r,
> >nymr-# (select count(*) as tally from roster_staff where
> >nymr(# rsdate = '2002-01-01' and rsgid = 11 and rsgsid = 2) as s
> >nymr-# where rodate = '2002-01-01' and rogid = 11 and rogsid = 2;
> > rodate | rogid | rogsid | rorequired | rooptional | tally
> >------------+-------+--------+------------+------------+-------
> > 2002-01-01 | 11 | 2 | 0 | 1 | 2
> >(1 row)
>
> Try something like:
>
> select r.*, count(*) from roster r, roster_staff s
> where rsdate = rodate and rsgid = rogid and rsgsid = rogid
> group by r.*
This one came up with a parser error near '*' but I don't understand it enough
to debug it.
>
> or
>
> select r.*, (select count(*) from roster_staff s
> where rsdate = rodate and rsgid = rogid and rsgsid = rogid
> ) roster r;
This one ran, but the count column had the same value in every row - the total
count for the table.
I've managed it using an intermediate view. I've also extended it to show
everything I need - see below. I'd still like to hear from anyone who could
tell me how I can do this without the intermediate view tho'
create table roster ( -- roster definition table - holding jobs to be done
rodate date not null,
rogid int4 references diagrams(gid), -- diagram
rogsid int4 references jobtypes(jid), -- jobtype
rorequired int4, -- essential staff
rooptional int4, -- optional staff
primary key (rodate, rogid, rogsid)
);
create table roster_staff ( -- people on the roster
rsdate date not null,
rsgid int4 references diagrams(gid), -- diagram
rsgsid int4 references jobtypes(jid), -- jobtype
rssid int4 references staff(sid), -- staff id.
constraint r2 foreign key (rsdate,rsgid,rsgsid) references roster
(rodate,rogid,rogsid)
);
create view roster_tally as
select rsdate, rsgid, rsgsid, count(*) as rocount
from roster_staff group by rsdate, rsgid, rsgsid;
create view roster_details as
select r.*, coalesce(t.rocount,0) as rocount, coalesce(a.rocount,0) as
roavail
from roster r
left outer join roster_tally t on r.rodate = t.rsdate and
r.rogid = t.rsgid and
r.rogsid = t.rsgsid
left outer join roster_tally a on r.rodate = a.rsdate and
a.rsgid is null and
r.rogsid = a.rsgsid;
nymr=# select * from roster_details where rocount < rorequired and roavail >
0;
rodate | rogid | rogsid | rorequired | rooptional | rocount | roavail
------------+-------+--------+------------+------------+---------+---------
2002-01-01 | 12 | 4 | 1 | 0 | 0 | 1
(1 row)
nymr=#
>
> May not be exactly right, but you should get the idea
>
>
> ----------------------------------------------------------------
> Philip Warner | __---_____
> Albatross Consulting Pty. Ltd. |----/ - \
> (A.B.N. 75 008 659 498) | /(@) ______---_
> Tel: (+61) 0500 83 82 81 | _________ \
> Fax: (+61) 03 5330 3172 | ___________ |
> Http://www.rhyme.com.au | / \|
>
> | --________--
>
> PGP key available upon request, | /
> and from pgp5.ai.mit.edu:11371 |/
--
Gary Stainburn
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To: pgsql-sql@postgresql.org
Cc: gary.stainburn@ringways.co.uk, pjw@rhyme.com.au
Subject: Re: Help on (sub)-select
In-Reply-To: <200212201148.24013.gary.stainburn@ringways.co.uk>
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