Found a simple but very good (even for your managers) video on YouTube which explains in simple sentences Sql best and worst practices for Oracle. Should be called SQL Best Practices for dummies! 🙂 The author is Stephane Faroult as I got it right from his introduction.
[youtube=http://www.youtube.com/watch?v=40Lnoyv-sXg&rel=1]
[youtube=http://www.youtube.com/watch?v=GbZgnAINjUw&rel=1]
[youtube=http://www.youtube.com/watch?v=y70FmugnhPU&rel=1]
Also Tom Kyte wrote an entry on his blog