The CONSTRAINT_TABLE_USAGE rowset identifies the tables that are used by referential constraints, unique constraints, check constraints, and assertions defined in the catalog and owned by a given user.
The CONSTRAINT_TABLE_USAGE rowset contains the following columns:
| Column name | Type indicator | Description |
| TABLE_CATALOG | DBTYPE_WSTR | Catalog name in which the table is defined. NULL if the provider does not support catalogs. |
| TABLE_SCHEMA | DBTYPE_WSTR | Unqualified schema name in which the table is defined. NULL if the provider does not support schemas. |
| TABLE_NAME | DBTYPE_WSTR | Table name. |
| CONSTRAINT_CATALOG | DBTYPE_WSTR | Catalog name. NULL if the provider does not support catalogs. |
| CONSTRAINT_SCHEMA | DBTYPE_WSTR | Unqualified schema name. NULL if the provider does not support schemas. |
| CONSTRAINT_NAME | DBTYPE_WSTR | Constraint name. |
Default Sort Order: TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME.