Subject | Re: Optimizing a count query |
---|---|
Author | dinol.softedge |
Post date | 2008-10-12T09:48:44Z |
Thanks Helen and Kjell
Helen won't that create multiple rows if there is more than one
employee? I need only one row per job card and all I'm really trying
to do is find out if there is an employee or not
Helen won't that create multiple rows if there is more than one
employee? I need only one row per job card and all I'm really trying
to do is find out if there is an employee or not
--- In firebird-support@yahoogroups.com, Helen Borrie <helebor@...> wrote:
>
> At 18:18 12/10/2008, you wrote:
> >Hi
> >
> >Sorry for not being clearer. I don't need to count the employees,
> >just find out if there is at least one per record in the tbl_job_card
> >table
>
> You only need an inner join to make this happen:
>
> SELECT
> tjc.EXCESS_PAID,
> tjc.JOB_CARD_ID,
> tjc.TIME_START,
> tjc.TIME_FINISH,
> tjc....l
> tjc.TIME_TAKEN,
> tc.ADDRESS AS CLIENT_ADDRESS,
> tc.SUBURB AS CLIENT_SUBURB,
> tc.....,
> tjc.ADVERT,
> ti.COMPANY AS INSURER_COMPANY,
> ti...,
> tc.TBL_CLIENT.TITLE || ' ' || tc.SURNAME || ', ' || tjc.JOB_TYPE
AS CAPTION,
> ...
> tjc.COORDINATES,
> tjc.VAT
> FROM
> TBL_JOB_CARD tjc
> join TBL_JOB_CARD_EMPLOYEE tjce
> on tjce.JOB_CARD_ID = tjc.JOB_CARD_ID
>
> LEFT OUTER JOIN TBL_CLIENT tc
> ON (tc.CLIENT_ID = tjc.CLIENT_ID)
> LEFT OUTER JOIN TBL_INSURER ti
> ON (ti.INSURER_ID = tjc.INSURER_ID)
> ORDER BY
> tjc.JOB_CARD_ID DESC <--- make sure you have a DESC index on
job_card_id
>
> ./heLen
>