I watched tutorials from the SQL course on Stanford site. I learned lots of great information about SQL. I am liking SQL so far because of the relative simplicity of commands. It is pretty straight forward as far as the commands doing what you want them to do. When you are able to break it down and think about one thing at a time, it makes it pretty easy to process the terminology that SQL uses. It went a little bit more into pi and sigma and how you project and select in queries.
SQL being a universal language makes it very helpful to learn. I started getting through videos describing some specific commands and what they do and how they can be used. I learned about the select command and how it applies to tables and with sets. I am interested in continuing to learn more about how SQL works.