Know your inner joins? What about your outer joins?
Don't know what I'm talking about?
If that's the case, you need to check out the SQL tutorial
Quackit's SQL Tutorial guides you through the most commonly used SQL statements, functions and keywords. If you need to build a database driven website, learning SQL is essential. SQL is the industry standard for performing database queries and various other database activities.
http://www.quackit.com/sql/tutorial
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