程序员之路：mysql表级约束与列级约束

彭世瑜发布时间：2017-10-19 21:57:07 ，浏览量：0

列级约束：对一个数据列建立的约束

表级约束：对多个数据列建立的约束

列级约束：既可以在列定义是声明，也可以在列定义之后声明

表级约束：只能在列定义之后声明。

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程序员之路：mysql表级约束与列级约束

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