Great article, thanks. I especially like the reminder to build and use databases for practice (music catalog, recipes, etc.) - I don't do enough of that experimentation, but it is a good, safe way to learn and try out new things.
webrunner
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A SQL query walks into a bar and sees two tables. He walks up to them and asks, "Can I join you?"
Ref.: http://tkyte.blogspot.com/2009/02/sql-joke.html