Found this today on codeproject.com, written by C.L. Moffatt: A really useful and visual guide to all the different types of SQL JOINs
If you need to know the difference between INNER JOIN, LEFT JOIN, OUTER JOIN, RIGHT JOIN etc etc then try here:
http://www.codeproject.com/Articles/33052/Visual-Representation-of-SQL-Joins
It even has a handy 'print out and put on the wall' graphic! Great stuff!
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