这里是MYSQL数据库加油站如果对你有帮助，给博主一个免费的点赞以示鼓励欢迎各位点赞评论收藏⭐️一、PK（主键约束）1、什么是主键？在了解主键之前，先了解一下什么是关键字关键字：在表中具有唯一性的字段，比如一个人的身份证号，学号。一个表中可以有多个关键字。主键也叫主关键字，就是由一个或多个关键字组成的，并且可以通过主键获得整个表的信息。比如订单表，通过订单编号可以获取到订单中的姓名，商品，价格等....

问答 2022-02-15 来自：开发者社区

在数据库SPJ下，创建供应商表S的sql语句，要求在列级设置主码，并将主码约束命名为S_PK

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更新时间 2024-06-01 19:31:04

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