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information_schema.KEY_COLUMN_USAGE

更新时间：2026-02-10 15:27:24

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功能

记录 column 中 key 的约束信息。

相关表/视图

__all_foreign_key_column
__all_foreign_key_column_history

字段说明

字段名称	类型	是否可以为空	描述

CONSTRAINT_CATALOG	varchar(3)	NO	固定值（def）
CONSTRAINT_SCHEMA	varchar(128)	NO	数据库名
CONSTRAINT_NAME	varchar(256)	NO	约束名，为 PRIMARY 或列名或外键名
TABLE_CATALOG	varchar(3)	NO	表目录
TABLE_SCHEMA	varchar(128)	NO	数据库名
TABLE_NAME	varchar(256)	NO	表名
COLUMN_NAME	varchar(128)	NO	列名
ORDINAL_POSITION	bigint(20)	NO	列在主键约束中的顺序位置（从 1 开始）
POSITION_IN_UNIQUE_CONSTRAINT	null	NO	对于唯一和主键约束，POSITION_IN_UNIQUE_CONSTRAINT 的值为 NULL。对于外键约束，它是所引用表内键中的顺序位置
REFERENCED_TABLE_SCHEMA	null	NO	参考的数据库
REFERENCED_TABLE_NAME	null	NO	参考的表
REFERENCED_COLUMN_NAME	null	NO	参考的列

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