Tag: 数据库

MySQL基本操作命令汇总–笔记

黄大少 | 2015-05-26

单表查询高级查询外键外键是指引用另一个表中的一列或者多列，被引用的列应该具有主键约束或者唯一性约束，用于建立和加强两个数据表之间的连接。一对多

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