39.19. `constraint_table_usage`
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## 39.19. `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 39.17. `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

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