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It's good enough for a beginner to start with. Provided they know it's not the complete picture.
by epochwolf 13y ago
It's good enough for a beginner to start with. Provided they know it's not the complete picture.
- quizotic 13y agoReally? Even if it NEVER produces the right answer? How is it useful then? A [inner|left|right|outer|cross|natural|whatever] join B NEVER produces a result that is in either A or B. It produces something larger, that wasn't it A or B before. It's like trying to describe the result of meiosis with a Venn diagram. It's the combinations that matter, and the combinations are not reflected in the Venn diagram.
- gburnett 13y agoIt's not that the picture is incomplete. It is, I believe, that the picture is incorrect. Sets are not relations. This is a barrier to understanding for a beginner.