The view referential_constraints contains all referential (foreign key) constraints in the current database. Only those constraints are shown for which the current user has write access to the referencing table (by way of being the owner or having some privilege other than SELECT).
referential_constraints ColumnsName
Data Type
Description
constraint_catalog
sql_identifier
Name of the database containing the constraint (always the current database)
constraint_schema
sql_identifier
Name of the schema containing the constraint
constraint_name
sql_identifier
Name of the constraint
unique_constraint_catalog
sql_identifier
Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database)
unique_constraint_schema
sql_identifier
Name of the schema that contains the unique or primary key constraint that the foreign key constraint references
unique_constraint_name
sql_identifier
Name of the unique or primary key constraint that the foreign key constraint references
match_option
character_data
Match option of the foreign key constraint: FULL, PARTIAL, or NONE.
update_rule
character_data
Update rule of the foreign key constraint: CASCADE, SET NULL, SET DEFAULT, RESTRICT, or NO ACTION.
delete_rule
character_data
Delete rule of the foreign key constraint: CASCADE, SET NULL, SET DEFAULT, RESTRICT, or NO ACTION.