Re: Getting one row for each subquery row...?

Use the IN instead of = and this will allow Postgres to return more than
one row in the sub-select

Darren

On Fri, 20 Jun 2003, Együd Csaba wrote:

> adding comments to a tableHi 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 pgoductgroup the t_stockchanges.productid belongs to.
>
> But one product can belong to many group, 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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--
Darren Ferguson