constraint_catalogsql_identifier

Name of the database that contains the constraint (always the current database)

constraint_schemasql_identifier

Name of the schema that contains the constraint

constraint_namesql_identifier

Name of the constraint

table_catalogsql_identifier

Name of the database that contains the table (always the current database)

table_schemasql_identifier

Name of the schema that contains the table

table_namesql_identifier

Name of the table

constraint_typecharacter_data

Type of the constraint: CHECK (includes not-null constraints), FOREIGN KEY, PRIMARY KEY, or UNIQUE

is_deferrableyes_or_no

YES if the constraint is deferrable, NO if not

initially_deferredyes_or_no

YES if the constraint is deferrable and initially deferred, NO if not

enforcedyes_or_no

Applies to a feature not available in Postgres Pro (currently always YES)

nulls_distinctyes_or_no

If the constraint is a unique constraint, then YES if the constraint treats nulls as distinct or NO if it treats nulls as not distinct, otherwise null for other types of constraints.