SQL VIEW Exercises: Create a view that shows each salesman with more than one customers
SQL VIEW : Exercise-12 with Solution
12. Write a query to create a view that shows each salesman with more than one customers.
Sample table: customer
Sample table: salesman
CREATE VIEW mcustomer AS SELECT * FROM salesman a WHERE 1 < (SELECT COUNT(*) FROM customer b WHERE a.salesman_id = b.salesman_id);
sqlpractice=# SELECT * sqlpractice-# FROM mcustomer; salesman_id | name | city | commission -------------+--------------+----------+------------ 5002 | Nail Knite | Paris | 0.13 5006 | Mc Lyon | Paris | 0.14 5003 | Lauson Hense | | 0.12 5001 | James Hoog | New York | 0.15 (4 rows)
Inventory database model:
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Previous: Write a query to create a view that shows the average and total orders for each salesman after his or her name. (Assume all names are unique)
Next: Write a query to create a view that shows all matches of customers with salesman such that at least one customer in the city of customer served by a salesman in the city of the salesman.
What is the difficulty level of this exercise?