A friend of mine asked me to do a tutorial on SQL, so here we go!  This article will begin to introduce relational database concepts and will end with a few examples of how to retrieve data from a database using the select keyword.  I'll stick to keeping this intro extremely basic - SQL heads please chime in with anything that might help someone just starting off in the world of databases.  We will be approaching this topic from the perspective of an application developer - not a Database Administrator.  Here's a TLDR for those who prefer to start at the end and work your way back to the beginning.