Postgresql 中文操作指南

37.18. constraint_column_usage #

视图 constraint_column_usage 标识当前数据库中所有由某个约束使用的列。仅显示属于当前已启用角色所拥有表的列。对于检查约束，该视图会标识在检查表达式中使用的列。对于外键约束，该视图会标识外键引用的列。对于唯一或主键约束，该视图会标识受约束的列。

The view constraint_column_usage identifies all columns in the current database that are used by some constraint. Only those columns are shown that are contained in a table owned by a currently enabled role. For a check constraint, this view identifies the columns that are used in the check expression. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint, this view identifies the constrained columns.

Table 37.16. constraint_column_usage Columns

Column Type

Description

table_catalog sql_identifier

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

table_schema sql_identifier

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

table_name sql_identifier

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

column_name sql_identifier

Name of the column 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