mysql联合索引数据结构表现形式

形式一（先记录，暂时无法验证正确性 ==||| ) 摘自：https://pdfs.semanticscholar.org/0d7b/8b9172a69fa069c9c38b5f01bd37a498563c.pdf • A B+-Tree on a composite key indexes the key values as if the composite key was a single k

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