SQL Exercises: Orders by customers not located in the same cities where their sales persons live

SQL Query on Multiple Tables: Exercise-3 with Solution

From the following tables, write a SQL query to find those salespeople who generated orders for their customers but are not located in the same city. Return ord_no, cust_name, customer_id (orders table), salesman_id (orders table).

Sample table: salesman

Sample table: customer

Sample table: orders

Sample Solution:

SELECT ord_no, cust_name, orders.customer_id, orders.salesman_id
FROM salesman, customer, orders
WHERE customer.city <> salesman.city
AND orders.customer_id = customer.customer_id
AND orders.salesman_id = salesman.salesman_id;

Output of the query:

ord_no	cust_name	customer_id	salesman_id
70004	Geoff Cameron	3009		5003
70003	Geoff Cameron	3009		5003
70011	Jozy Altidor	3003		5007
70001	Graham Zusi	3005		5002
70007	Graham Zusi	3005		5002
70012	Julian Green	3008		5002

Relational Algebra Expression:

Relational Algebra Tree:

Explanation:

Pictorial presentation :

Practice Online

Query Visualization:

Duration:

Rows:

Cost:

Note: The pictorial represetation above is based on hypothetical table for the purpose of explanation only. Your answer may not match.

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