SQL Exercises: Order which will be delivered by a specified salesman

Last update on December 20 2024 11:55:19 (UTC/GMT +8 hours)

From the following table, write a SQL query to find orders that are delivered by a salesperson with ID. 5001. Return ord_no, ord_date, purch_amt.

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

Sample Solution:

-- This query selects specific columns 'ord_no', 'ord_date', and 'purch_amt' from the 'orders' table.
SELECT ord_no, ord_date, purch_amt
-- Specifies the table from which to retrieve the data (in this case, 'orders').
FROM orders
-- Filters the rows to only include those where the 'salesman_id' column has the value 5001.
WHERE salesman_id = 5001;

Output of the Query:

ord_no	ord_date	purch_amt
70002	2012-10-05	65.26
70005	2012-07-27	2400.60
70008	2012-09-10	5760.00
70013	2012-04-25	3045.60

Code Explanation:

The given query in SQL that selects the "ord_no", "ord_date" and "purch_amt" columns from the 'orders' table where the value of "salesman_id" column is 5001. By using the WHERE clause, we filter the rows and only return the rows matching the condition.

Relational Algebra Expression: