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 32-12. 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 |