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Re: Group by within table joins

From: Jie Liang <jliang(at)ipinc(dot)com>
To: Bernie Huang <bernie(dot)huang(at)ec(dot)gc(dot)ca>
Cc: PGSQL-SQL <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Group by within table joins
Date: 2000-09-13 23:28:50
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-sql

If you use group then except aggreate functions(count,sum..)
other items in your select list should be in your group list also.

Bernie Huang wrote:

> Hi, I have the following SQL:
> SELECT ltb.v_id,
>        count(ltb.v_id) AS num_of_times_borrowed,
>        vtb.equip_attr[1] AS year,
>        vtb.equip_attr[3] AS model,
>        vtb.equip_attr[4] AS type
> FROM log_tb ltb, vehicle_tb vtb
> WHERE ltb.v_id=vtb.equip_id
> GROUP BY ltb.v_id
> ORDER BY year;
> "ERROR: Attribute vtb.equip_attr must be GROUPed or used in an aggregate
> function"
> but, it didn't work.  I want to know how many time each vehicle has been
> borrowed. Please help.  Thanks.
> - Bernie


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