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
table_catalog
sql_identifier
Name of the database that contains the table (always the current database)
table_schema
sql_identifier
Name of the schema that contains the table
table_name
sql_identifier
Name of the table
constraint_type
character_data
Type of the constraint: CHECK, FOREIGN KEY, PRIMARY KEY, or UNIQUE
is_deferrable
yes_or_no
YES if the constraint is deferrable, NO if not
initially_deferred
yes_or_no
YES if the constraint is deferrable and initially deferred, NO if not
enforced
yes_or_no
Applies to a feature not available in PostgreSQL (currently always YES)