Hi Mikhail!
The query should be released automaticly and it shoulb be something like:
SELECT a.*,b.*,c.* FROM ?????? WHERE b.field3=5 OR c.field6=16
I want to have all entries wich fit to the condition. But at this time I don't know
weather there is a entry with name="test" or "test2" or not. So when there is none it
should return some NULLs otherwise the entries.
I already tries using LEFT JOINs, but it doesn't work the way I want it to.
Do you think there is a proper way to solve this problem?
CU,
Peter
"Mikhail Entaltsev" <[EMAIL PROTECTED]> schrieb am 19.09.02 11:36:16:
> Peter,
>
> If you would like to get such resultset
>
> > name field1 field2 field3 field4 field5 field6
> > -----------------------------------------------------------------
> > test 1 2 5 6 9 10
> > test 1 2 5 6 11 12
> > test2 3 4 NULL NULL 15 16
>
> then you need to use left join for t2, but based only on these information
> I couldn't help you to implement this query (I don't know how to group by
> rows).
> Please, give more information about why do you need exactly this resultset.
>
> Best regards,
> Mikhail.
>
> ----- Original Message -----
> From: "Peter St�cker" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, September 19, 2002 11:03 AM
> Subject: JOIN-Question
>
>
> > Hi there!
> >
> > I have a question on JOINs.
> >
> > First the system:
> >
> > table1: name: t1
> > entries: name field1 field2
> > ------------------------
> > test 1 2
> > test2 3 4
> >
> > table2: name t2
> > entries: name field3 field4
> > ------------------------
> > test 5 6
> > test 7 8
> >
> > table3: name t3
> > entries: name field5 field6
> > ------------------------
> > test 9 10
> > test 11 12
> > test2 13 14
> > test2 15 16
> >
> > And here the problem:
> >
> > with the query
> >
> > SELECT a.*, b.*, c.* FROM t1 a INNER JOIN t2 b USING(name) INNER JOIN t3 c
> USING(name) WHERE b.field3=7 OR c.field6=16;
> >
> > I only get 1 entry with name="test".
> >
> > By using LEFT JOIN I only get name="test" either. For sure, because in
> table2 there is no test2 entry.
> >
> > The only 2 ways I know to get also test2:
> > 1. "INSERT INTO t2 VALUES("test2",NULL,NULL)"
> > 2. temporary table
> >
> > But I don't want to have such dummy entries or a temporary table. Does
> anybody know what I have to do to with:
> >
> > SELECT a.*,b.*,c.* FROM ?????? WHERE b.field3=5 OR c.field6=16
> >
> >
> > the result:
> >
> >
> > name field1 field2 field3 field4 field5 field6
> > -----------------------------------------------------------------
> > test 1 2 5 6 9 10
> > test 1 2 5 6 11 12
> > test2 3 4 NULL NULL 15 16
> >
> >
> > I hope that someone can help me!
> >
> > Thank a lot,
> > Peter
> >
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