From: Együd Csaba <csegyud@freemail.hu>
To: pgsql-sql@postgresql.org
Subject: Getting one row for each subquery row...?
Date: Fri, 20 Jun 2003 07:12:51 +0200
Message-ID: <007901c336ea$9cee0e80$230a0a0a@compaq> (raw)
Hi All,
here are my three tables. I wold like to list them in the following way: I
need all the columns from t_stockchanges, and one field for the
productgroup
the t_stockchanges.productid belongs to.
But one product can belong to many groups, so i would need one row for each
group for each product.
My bad query is:
------------------------
DB=# select t_stockchanges.productid, (select name from t_productgroups
where id=(select productgroupid from t_prod_in_pgr where
productid=t_stockchanges.productid)) as pgroup from t_stockchanges;
ERROR: More than one tuple returned by a subselect used as an expression.
DB=#
---------------
Yes, this is absolutelly true, but I would like postgres to give me all the
tuples found. How can I ask him to do so?
Thank you,
-- Csaba
---------------------------------------------------------------------------
-
----------------------------------------------------
Table "public.t_stockchanges"
Column | Type | Modifiers
---------------+------------------+----------------------------------------
-
------------
id | integer | not null
stockid | integer | not null
productid | integer | not null
changeid | integer | not null
quantity | double precision | not null
date | character(19) | not null
purchaseprice | double precision | not null
correction | double precision | not null
userid | integer | not null
time | character(19) | default to_char(now(), 'YYYY.mm.dd
hh:mi:ss'::text)
prooftype | character(10) | not null default ''
proofid | integer | default 0
Indexes: t_stockchanges_pkey primary key btree (id),
t_stockchanges_date btree (date),
t_stockchanges_productid btree (productid)
---------------------------------------------------------------------------
-
----------------------------------------------------
Table "public.t_productgroups"
Column | Type | Modifiers
-------------+-----------------------+-----------
id | integer | not null
name | character varying(30) | not null
description | character varying |
root | boolean |
Indexes: t_productgroups_pkey primary key btree (id)
---------------------------------------------------------------------------
-
----------------------------------------------------
Table "public.t_prod_in_pgr"
Column | Type | Modifiers
----------------+---------+-----------
productgroupid | integer | not null
productid | integer | not null
---------------------------------------------------------------------------
-
----------------------------------------------------
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To: pgsql-sql@postgresql.org
Cc: csegyud@freemail.hu
Subject: Re: Getting one row for each subquery row...?
In-Reply-To: <007901c336ea$9cee0e80$230a0a0a@compaq>
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