SELECT * FROM a1 LEFT JOIN b1 ON a1.f1=b1.f1 AND a1.f2=b1.f2
In you example query, MySQL will try to do the LEFT JOIN first (I'm pretty sure), which is not what you what. But if you change it to a RIGHT JOIN, it will do it last, which is what I think you are looking for. The LEFT and RIGHT join syntax are exactly the same.
On Feb 9, 2004, at 3:47 PM, David Perron wrote:
Is there a way to do this? Im trying to LEFT JOIN to a table that needs to
select based on 2 keys, but the query Im writing only has the keys
individually in two separate tables, like this.
The documentation shows how to do this when you are using 2 keys from both
tables, but not 1 key from 1 table and another key from another table
combined.
http://www.mysql.com/doc/en/JOIN.html
SELECT FROM t1, INNER JOIN t2 on (c1) INNER JOIN t3 on (c2) LEFT JOIN t4 on (c1,c2)
Thanks!
-- Brent Baisley Systems Architect Landover Associates, Inc. Search & Advisory Services for Advanced Technology Environments p: 212.759.6400/800.759.0577
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