Comments on: Everything PHP: Multiple Table Joins http://blog.bluefur.com/2009/12/30/php-multiple-table-joins/ Just another Hosting weblog Thu, 24 Nov 2011 01:38:42 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Justin Swanhart http://blog.bluefur.com/2009/12/30/php-multiple-table-joins/comment-page-1/#comment-131642 Justin Swanhart Thu, 31 Dec 2009 00:39:22 +0000 http://blog.bluefur.com/?p=5710#comment-131642 While the JOIN syntax provided is valid, it is highly unusual. I've been a DBA for a long time, and I've never actually encountered a SQL statement which uses the /table_references/ variant of the ANSI join clause. One will usually see: 1. SELECT * FROM table1 JOIN table2 ON table1.id = table2.id JOIN table3 ON table1.name = table3.name JOIN table4 ON table1.email = table4.email or SELECT * FROM table1,table2,table3,table4 WHERE table1.id = table2.id AND table1.name = table3.name AND table1.email = table4.email While the JOIN syntax provided is valid, it is highly unusual. I’ve been a DBA for a long time, and I’ve never actually encountered a SQL statement which uses the /table_references/ variant of the ANSI join clause.

One will usually see:
1.
SELECT *
FROM table1
JOIN table2
ON table1.id = table2.id
JOIN table3
ON table1.name = table3.name
JOIN table4
ON table1.email = table4.email

or

SELECT *
FROM table1,table2,table3,table4
WHERE table1.id = table2.id
AND table1.name = table3.name
AND table1.email = table4.email

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