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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