MySQL中index和key的关系,好冷啊……

KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definition. This was implemented for compatibility with other database systems.

简言之,在MySQL中,INDEX和KEY的概念是一样的。PRIMARY KEY要求NOT NULL,其他KEY不要求。

2 thoughts on “MySQL中index和key的关系,好冷啊……

  1. coder4feizhoulv

    同意,
    用mysql workbench创建时找不到KEY关键字,逆向工程给出的结果是INDEX,原来是同一个东西。

    Reply

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