check_constraint_routine_usage
   The view check_constraint_routine_usage
   identifies routines (functions and procedures) that are used by a
   check constraint.  Only those routines are shown that are owned by
   a currently enabled role.
  
Table 37.6. check_constraint_routine_usage Columns
| Column Type Description | 
|---|
| 
        Name of the database containing the constraint (always the current database) | 
| 
        Name of the schema containing the constraint | 
| 
        Name of the constraint | 
| 
        Name of the database containing the function (always the current database) | 
| 
        Name of the schema containing the function | 
| 
        The “specific name” of the function. See Section 37.45 for more information. |