/*Write a SQL statement to make a list for the salesmen who works either for one or more customer or not yet join under any of 
the customers who placed either one or more orders or no order to their supplier.*/
SELECT a.cust_name,a.city,a.grade,   
b.name AS "Salesman",   
c.ord_no, c.ord_date, c.purch_amt   
FROM customer a   
RIGHT OUTER JOIN salesman b   
ON b.salesman_id=a.salesman_id   
RIGHT OUTER JOIN orders c   
ON c.customer_id=a.customer_id;