PostgreSQL 7.4 Documentation
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# 32.11. 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 the current user. (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 32-9. 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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