• I really liked this article - very thorough. EXCEPT seems to be an analog to the Oracle MINUS, so sometimes I like it because I feel like I really know what's happening there (Oracle SQL being my first SQL language). But, my alternative is to use NOT EXISTS, so I wonder if you would consider expanding this to include the EXISTS/NOT EXISTS alternatives? I'm curious to see how they stack up within your example stream.

    In general, I really liked the approach and illustrations (both pictoral and logical).

    Thank you --

    Donna