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 35.6. 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 35.41 for more information.  |