Re: SUM() & GROUP BY

On Sun, 2003-09-28 at 19:01, Muhyiddin A.M Hayat wrote:
>
> hotel=# SELECT
> hotel-# "public".billing.id,
> hotel-# "public".billing.guest_id,
> hotel-# "public".billing.trx_date,
> hotel-# "public".billing.trx_time,
> hotel-# "public".billing.payment_method,
> hotel-# "public".billing.tax,
> hotel-# "public".billing.dep_id,
> hotel-# "public".department."name",
> hotel-# SUM("public".items.price) AS total,
> hotel-# "public".billing.amount_paid
> hotel-# FROM
> hotel-# "public".billing_items
> hotel-# INNER JOIN "public".billing ON
> ("public".billing_items.billing_id = "public".billing.id)
> hotel-# INNER JOIN "public".department ON ("public".billing.dep_id =
> "public".department.id)
> hotel-# INNER JOIN "public".items ON
> ("public".billing_items.items_id = "public".items.id)
> hotel-# GROUP BY "public".billing.id;
> ERROR: Attribute billing.guest_id must be GROUPed or used in an
> aggregate function
> hotel=#
>
> What Worng ??

Any items in the select list need to be aggregated (e.g.
SUM("public".items.price)) or mentioned in the GROUP BY list. Suppose
there are several billing.guest_id values for each billing.id; which
value should be listed in the output?

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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