ORA-41693
        invalid attribute or data type for an aggregate operator: string
        
        
        Cause
        An attempt was made to apply an aggregate operator on an invalid attribute or an  attribute with invalid or unsupported data type in the aggregate  operator. Only NUMBER and DATE attributes are allowed in the aggregate operators.
        Action
        Correct the input and try again.
        
     
    
    
        ORA-41693
        invalid attribute or data type for an aggregate operator: string
        
        
        Cause
        An attempt was made to apply an aggregate operator on an invalid attribute or an  attribute with invalid or unsupported data type in the aggregate  operator. Only NUMBER and DATE attributes are allowed in the aggregate operators.
        Action
        Correct the input and try again.
        
     
    
    
        ORA-41693
        invalid attribute or data type for an aggregate operator: string
        
        
        Cause
        An attempt was made to apply an aggregate operator on an invalid attribute or an  attribute with invalid or unsupported data type in the aggregate  operator. Only NUMBER and DATE attributes are allowed in the aggregate operators.
        Action
        Correct the input and try again.