check constraints

SELECT constraint_name, constraint_type, column_name, STATUS
from user_constraints natural join user_cons_columns
where table_name = 'XX';

SELECT *
  FROM user_cons_columns
 WHERE table_name = 'XX';

 

for detalis need another sql 

 

 SELECT *
  FROM user_constraints
 WHERE table_name = 'XX'
   AND constraint_name = 'XX';