REFERENTIAL_CONSTRAINTS view¶

This Account Usage view displays a row for each FOREIGN KEY constraint that is defined for tables in the account.

FOREIGN KEY constraints are used to enforce referential integrity. For more information, see Constraints and Referential Integrity Constraints.

To return information about other constraint types (as well as FOREIGN KEY constraints), query the TABLE_CONSTRAINTS view.

Columns¶

Column Name	Data Type	Description
CONSTRAINT_CATALOG_ID	NUMBER	Internal/system-generated identifier for the database of the constraint.
CONSTRAINT_CATALOG	TEXT	Database that the constraint belongs to
CONSTRAINT_SCHEMA_ID	NUMBER	Internal/system-generated identifier for the schema of the constraint.
CONSTRAINT_SCHEMA	TEXT	Schema that the constraint belongs to
CONSTRAINT_NAME	TEXT	Name of the constraint
UNIQUE_CONSTRAINT_CATALOG_ID	NUMBER	Internal/system-generated identifier for the database of the current constraint.
UNIQUE_CONSTRAINT_CATALOG	TEXT	Database of the unique constraint referenced by the current constraint.
UNIQUE_CONSTRAINT_SCHEMA_ID	NUMBER	Internal/system-generated identifier for the schema of the constraint.
UNIQUE_CONSTRAINT_SCHEMA	TEXT	Schema of the unique constraint referenced by the current constraint.
UNIQUE_CONSTRAINT_NAME	TEXT	Name of the unique constraint referenced by the current constraint.
MATCH_OPTION	TEXT	Match option for the constraint.
UPDATE_RULE	TEXT	Update Rule for the current constraint.
DELETE_RULE	TEXT	Delete Rule for the current constraint.
COMMENT	TEXT	Comment for the constraint.
CREATED	TIMESTAMP_LTZ	Date and time when the constraint was created.
LAST_ALTERED	TIMESTAMP_LTZ	Date and time the object was last altered by a DML, DDL, or background metadata operation. See Usage Notes.
DELETED	TIMESTAMP_LTZ	Date and time when the constraint was dropped.

The view only displays objects for which the current role for the session has been granted access privileges.
The LAST_ALTERED column is updated when the following operations are performed on an object:
- DDL operations.
- DML operations (for tables only). This column is updated even when no rows are affected by the DML statement.
- Background maintenance operations on metadata performed by Snowflake.