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Visual explanation of MySQL joins: Difference between revisions
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→狀況3: 聯集的資料
m (→狀況1: 交集的資料) |
m (→狀況3: 聯集的資料) |
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</pre> | </pre> | ||
== 狀況3: | == 狀況3: 聯集的資料，a 和 b 的所有資料 == | ||
http://planetoid.info/images/Venn_diagrams_union_of_two_sets.png | http://planetoid.info/images/Venn_diagrams_union_of_two_sets.png | ||