Understand SQL JOINS visually and interactive

[spathon]

How INNER, LEFT, RIGTH and OUTER JOIN works is a common question and not always easy to remember. Here you can see the different joins visually and through interaction

[jlewallen]

This is good timing, as my dad (a SQL novice) is going to be taking a course on SQL soon and references like would really help, any others I should know about?

[spathon]

I hope this will help :) Not what I know of but if you have any ideas please share so can I expand the page.