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Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly. You can read PostgreSQL as Postgres-XC except for version number, which is specific to each product.
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 33-16. constraint_table_usage Columns
| Name | Data 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 |