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information_schema.REFERENTIAL_CONSTRAINTS

更新时间：2023-07-18 17:25:59

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功能

用于展示外键约束的元数据。

字段说明

字段名称	类型	是否可以为 NULL	描述
CONSTRAINT_CATALOG	varchar(4096)	NO	该值始终为 def
CONSTRAINT_SCHEMA	varchar(128)	NO	约束所属库的名称
CONSTRAINT_NAME	varchar(128)	NO	约束名称
UNIQUE_CONSTRAINT_CATALOG	varchar(4096)	NO	该值始终为 def
UNIQUE_CONSTRAINT_SCHEMA	`varchar(128)`	NO	约束引用的唯一约束或主键所在库的名称
UNIQUE_CONSTRAINT_NAME	varchar(128)	YES	约束引用的唯一约束或主键的名称
MATCH_OPTION	varchar(64)	NO	约束 MATCH 属性的值。此时唯一有效的值是 NONE
UPDATE_RULE	varchar(64)	NO	约束 ON UPDATE 属性的值。可能的值是CASCADE、SET NULL、RESTRICT、NO ACTION
DELETE_RULE	varchar(64)	NO	约束 ON DELETE 属性的值。可能的值是 CASCADE、SET NULL、RESTRICT、NO ACTION
TABLE_NAME	varchar(256)	NO	约束所在子表的名称
REFERENCED_TABLE_NAME	varchar(256)	NO	约束所引用父表的名称

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