It's been around even before 2009(the date of this article). Back in 2007 Jeff Atwood posted pretty much the same thing [1]. [1] http://www.codinghorror.com/bl

It's been around even before 2009(the date of this article). Back in 2007 Jeff Atwood posted pretty much the same thing [1]. [1] http://www.codinghorror.com/blog/2007/10/a-visual-explanation-of-sql-joins.html http://www.codinghorror.com/blog/2007/10/a-visual-explanatio...