## 37.19. `constraint_table_usage`

 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<br/><br/> Description                                                          |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
|`table_catalog` `sql_identifier`<br/><br/> Name of the database that contains the table that is used by some constraint (always the current database)|
|                `table_schema` `sql_identifier`<br/><br/> Name of the schema that contains the table that is used by some constraint                 |
|                              `table_name` `sql_identifier`<br/><br/> Name of the table that is used by some constraint                              |
|           `constraint_catalog` `sql_identifier`<br/><br/> Name of the database that contains the constraint (always the current database)           |
|                           `constraint_schema` `sql_identifier`<br/><br/> Name of the schema that contains the constraint                            |
|                                         `constraint_name` `sql_identifier`<br/><br/> Name of the constraint                                         |

