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information_schema.CHECK_CONSTRAINTS

更新时间：2023-07-18 17:25:59

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功能

记录了 CREATE TABLE 操作时，有关表和列相关的约束信息。

字段说明

字段名称	类型	是否可以为 NULL	描述
CONSTRAINT_CATALOG	varchar(4096)	NO	约束所属的目录名称。该值始终为 `def`
CONSTRAINT_SCHEMA	varchar(128)	NO	约束所属的 `SCHEMA` 名称
CONSTRAINT_NAME	varchar(128)	NO	约束的名称
CHECK_CLAUSE	varchar(2048)	NO	指定约束条件的表达式

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