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Thread: Group by within table joins

Group by within table joins

From
Bernie Huang
Date:
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
Attachment

Re: Group by within table joins

From
Jie Liang
Date:
Hey,

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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Re: Group by within table joins

From
Josh Berkus
Date:
Mr. Huang,

Seems to me that your GROUP BY line should read:

GROUP BY ltb.v_id, vtb.equip_attr[1], vtb.equip_attr[3],
vtb.equip_attr[4]

Or am I missing the point?
            -Josh

> 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;


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