Postgresql 中文操作指南

37.19. constraint_table_usage #

视图 constraint_table_usage 标识当前数据库中所有由某些约束使用并且由当前启用的角色拥有的表。（这与视图 table_constraints 不同，后者标识所有表约束以及它们被定义的表。）对于外键约束，此视图标识外键所引用的表。对于唯一或主键约束，此视图简单地标识该约束所属的表。检查约束和非空约束不包括在此视图中。

The view constraint_table_usage identifies all tables in the current database that are used by some constraint and are owned by a currently enabled role. (This is different from the view table_constraints, which identifies all table constraints along with the table they are defined on.) For a foreign key constraint, this view identifies the table that the foreign key references. For a unique or primary key constraint, this view simply identifies the table the constraint belongs to. Check constraints and not-null constraints are not included in this view.

Table 37.17. constraint_table_usage Columns

Column Type

Description

table_catalog sql_identifier

Name of the database that contains the table that is used by some constraint (always the current database)

table_schema sql_identifier

Name of the schema that contains the table that is used by some constraint

table_name sql_identifier

Name of the table that is used by some constraint

constraint_catalog sql_identifier

Name of the database that contains the constraint (always the current database)

constraint_schema sql_identifier

Name of the schema that contains the constraint

constraint_name sql_identifier

Name of the constraint