Nice that this came up when it did.. I'm currently struggling with a three-table join.
Table1.PK = Table2.FK1 Table3.PK = Table2.FK2 My last effort looks something like: SELECT SomeStuff FROM Table1 AS T1 LEFT JOIN Table2 AS T2 ON T1.PK = T2.FK1 RIGHT JOIN Table3 AS T3 ON T2.FK2 = T3.PK WHERE T1.PK=999 I want it to return 1 row, but it's returning as many rows as there are in Table3. Where am I goofing? TIA, Tab mysql -----Original Message----- From: Michael T. Babcock [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 15, 2003 8:30 AM To: Josh L Bernardini Cc: [EMAIL PROTECTED] Subject: Re: three table join I've wanted to post this query example a few times (and I hope I got it right; mornings aren't my best time) ... multiple JOINs: SELECT stuff FROM table1 LEFT JOIN table2 ON table1.fk = table2.pk LEFT JOIN table3 ON table2.fk = table3.pk WHERE other_conditions ... You can repeat that as many levels as you want (performance depends on indexing and the optimizer). You need to think in terms of what would be equal to what between tables in the correct result row. So if you would do a secondary sub-select of "SELECT fk from table2 where ..." then you end up with a left join like above. --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
