From the following tables, write a SQL query to find those customers where each customer has a grade and served by at least a salesperson

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From the following tables, write a SQL query to find those customers where each customer has a grade and served by at least a salesperson who belongs to a city. Return cust_name as "Customer", grade as "Grade".

Sample table: salesman

salesman_id |    name    |   city   | commission 
-------------+------------+----------+------------
        5001 | James Hoog | New York |       0.15
        5002 | Nail Knite | Paris    |       0.13
        5005 | Pit Alex   | London   |       0.11
        5006 | Mc Lyon    | Paris    |       0.14
        5007 | Paul Adam  | Rome     |       0.13
        5003 | Lauson Hen | San Jose |       0.12
Sample table: customer
customer_id |   cust_name    |    city    | grade | salesman_id 
-------------+----------------+------------+-------+-------------
        3002 | Nick Rimando   | New York   |   100 |        5001
        3007 | Brad Davis     | New York   |   200 |        5001
        3005 | Graham Zusi    | California |   200 |        5002
        3008 | Julian Green   | London     |   300 |        5002
        3004 | Fabian Johnson | Paris      |   300 |        5006
        3009 | Geoff Cameron  | Berlin     |   100 |        5003
        3003 | Jozy Altidor   | Moscow     |   200 |        5007
        3001 | Brad Guzan     | London     |       |        5005
Sample table: orders
ord_no      purch_amt   ord_date    customer_id  salesman_id
----------  ----------  ----------  -----------  -----------
70001       150.5       2012-10-05  3005         5002
70009       270.65      2012-09-10  3001         5005
70002       65.26       2012-10-05  3002         5001
70004       110.5       2012-08-17  3009         5003
70007       948.5       2012-09-10  3005         5002
70005       2400.6      2012-07-27  3007         5001
70008       5760        2012-09-10  3002         5001
70010       1983.43     2012-10-10  3004         5006
70003       2480.4      2012-10-10  3009         5003
70012       250.45      2012-06-27  3008         5002
70011       75.29       2012-08-17  3003         5007
70013       3045.6      2012-04-25  3002         5001

الأجوبة

Sample Solution:

SELECT customer.cust_name AS "Customer",
customer.grade AS "Grade"
FROM orders, salesman, customer
WHERE orders.customer_id = customer.customer_id
AND orders.salesman_id = salesman.salesman_id
AND salesman.city IS NOT NULL
AND customer.grade IS NOT NULL;
Output of the query:
Customer	Grade
Nick Rimando	100
Geoff Cameron	100
Brad Davis	200
Nick Rimando	100
Fabian Johnson	300
Geoff Cameron	100
Jozy Altidor	200
Nick Rimando	100
Graham Zusi	200
Graham Zusi	200
Julian Green	300
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أسئلة مشابهة

From the following tables, write a SQL query to find those salespeople who generated orders for their customers but not located in the same city
From the following tables, write a SQL query to find those salespeople who earned the maximum commission. Return ord_no, purch_amt, ord_date, and salesman_id
From the following tables write a SQL query to list all salespersons along with customer name, city, grade, order number, date, and amount
From the following tables, create a view to get the salesperson and customer by name

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