Visual explanation of MySQL joins: Difference between revisions

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== 狀況1: 交集的資料 ==
== 狀況1: 交集的資料,同時存在於 a 和 b ==
http://planetoid.info/images/Venn_diagrams_intersection_of_two_sets.png
http://planetoid.info/images/Venn_diagrams_intersection_of_two_sets.png


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