MySQL :: MySQL 8.4 参考手册 :: 28.3.5 INFORMATION_SCHEMA CHECK

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MySQL 8.4 参考手册 / 28 个 INFORMATION_SCHEMA 表 / 28.3 INFORMATION_SCHEMA 总表 / 28.3.5 INFORMATION_SCHEMA CHECK_CONSTRAINTS 表

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28.3.5 INFORMATION_SCHEMA CHECK_CONSTRAINTS 表28.3.5 The INFORMATION_SCHEMA CHECK_CONSTRAINTS Table

CREATE TABLE 支持表和列 CHECK 约束的核心功能；CHECK_CONSTRAINTS 表提供有关这些约束的信息。CREATE TABLE supports the core features of table and column CHECK constraints; the CHECK_CONSTRAINTS table provides information about these constraints.

CHECK_CONSTRAINTS 表具有以下列：The CHECK_CONSTRAINTS table has these columns:

CONSTRAINT_CATALOGCONSTRAINT_CATALOG
约束所属的目录名称。该值始终为 def。The name of the catalog to which the constraint belongs. This value is always def.
CONSTRAINT_SCHEMACONSTRAINT_SCHEMA
约束所属的模式（数据库）名称。The name of the schema (database) to which the constraint belongs.
CONSTRAINT_NAMECONSTRAINT_NAME
约束的名称。The name of the constraint.
CHECK_CLAUSE
指定约束条件的表达式。The expression that specifies the constraint condition.

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