Re: Sql question

"michel guerillot" <michel.guerillot_at_free.fr> wrote in message news:3e07508a$0$17169$626a54ce_at_news.free.fr...
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> Hi,
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> is it possible using only SQL selects ?
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> i have 2 tables (fields)
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> objects(code,desc) and events(event_code,date_Event,object_code)
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> join by objects.code=events.object_code
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> my problem is to know for each object (also if it has no event) the number
> of "replay events" in the trimestry ( counted only if the same objects had
> one or more event in the previous trimestry ....date_event-90.....)and
the
> number of events in the trimestry
>
> something like this graphicly
>
> objects replay _events events
> --------------------------------------------
> obj1 2 4
> obj2 0 2
> obj3 1 3
> obj4 0 0
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> thanks
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You'll need outer join. objects.code=events.object_code(+)

Hth

--
Sybrand Bakker
Senior Oracle DBA

to reply remove '-verwijderdit' from my e-mail address



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