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 Stöcker" <[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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