The REFERENTIAL_CONSTRAINTS rowset identifies the referential constraints defined in the catalog that are owned by a given user.
The REFERENTIAL_CONSTRAINTS rowset contains the following columns.
| Column name | Type indicator | Description |
| 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. |
| UNIQUE_CONSTRAINT_ CATALOG |
DBTYPE_WSTR | Catalog name in which the unique or primary key constraint is defined. NULL if the provider does not support catalogs. |
| UNIQUE_CONSTRAINT_ SCHEMA |
DBTYPE_WSTR | Unqualified schema name in which the unique or primary key constraint is defined. NULL if the provider does not support schemas. |
| UNIQUE_CONSTRAINT_ NAME |
DBTYPE_WSTR | Unique or primary key constraint name. |
| MATCH_OPTION | DBTYPE_WSTR | "NONE"—No <match type> was specified. "PARTIAL"—A <match type> of PARTIAL was specified. "FULL"—A <match type> of FULL was specified. |
| UPDATE_RULE | DBTYPE_WSTR | If an <update rule> was specified then the UPDATE_RULE value is one of the following: "CASCADE"—A <referential action> of CASCADE was specified. "SET NULL"—A <referential action> of SET NULL was specified. "SET DEFAULT"—A <referential action> of SET DEFAULT was specified. "NO ACTION"—A <referential action> of NO ACTION was specified. |
| DELETE_RULE | DBTYPE_WSTR | If a <delete rule> was specified, then the DELETE_RULE value is one of the following: "CASCADE"—A <referential action> of CASCADE was specified. "SET NULL"—A <referential action> of SET NULL was specified. "SET DEFAULT"—A <referential action> of SET DEFAULT was specified. "NO ACTION"—A <referential action> of NO ACTION was specified. |
| DESCRIPTION | DBTYPE_WSTR | Human-readable description of the constraint. |
Default Sort Order: CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME, UNIQUE_CONSTRAINT_CATALOG, UNIQUE_CONSTRAINT_SCHEMA, UNIQUE_CONSTRAINT_NAME