SQL Exercise: Using NOT, AND operators with specified condition

SQL Boolean Operator Statement: Exercise-8 with Solution.

From the following table, write a SQL query to find details of all orders with a purchase amount less than 200 or exclude orders with an order date greater than or equal to '2012-02-10' and a customer ID less than 3009. Return ord_no, purch_amt, ord_date, customer_id and salesman_id.

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 all columns from the 'orders' table.
SELECT *
-- Specifies the table from which to retrieve the data (in this case, 'orders').
FROM orders
-- Filters the rows to only include those where either the 'purch_amt' is less than 200
-- or the conditions inside the parentheses following 'NOT' are not true.
WHERE (purch_amt < 200 OR NOT (ord_date >= '2012-02-10' AND customer_id < 3009));

Output of the Query:

ord_no	purch_amt	ord_date	customer_id	salesman_id
70002	65.26		2012-10-05	3002		5001
70004	110.50		2012-08-17	3009		5003
70003	2480.40		2012-10-10	3009		5003
70011	75.29		2012-08-17	3003		5007
70001	150.50		2012-10-05	3005		5002

Code Explanation:

The SQL query that is selecting all columns (*) from the 'orders' table where the value of the "purch_amt" column is less than 200 or NOT ( the value of the "ord_date" column is greater than or equal to '2012-02-10' and the value of the "customer_id" column is less than 3009).
All rows from the 'orders' table that meet either of these criteria will be returned as a result of the query.
It will return all the rows where purchase amount is less than 200 or ord_date is less than '2012-02-10' or customer_id is greater or equal to 3009.

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