PostgreSQL 8.4.2 Documentation
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# 33.14. `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 33-12. `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

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