MySQL NOT

The MySQL NOT operator is a logical operator used to negate a condition. It is used to reverse the logical value of a condition, making a true condition false and vice versa. The NOT operator is often used in the WHERE clause of SQL queries to filter out rows that do not satisfy a particular condition.

The basic syntax for using the NOT operator is as follows:

SELECT columns
FROM table
WHERE NOT condition;

Here’s how it works:

• condition is the logical condition you want to negate.
• If condition is true, the NOT operator will make it false, and the row will be excluded from the result set.
• If condition is false, the NOT operator will make it true, and the row will be included in the result set.

Here are some examples to illustrate the use of the NOT operator:

1. Match all records where the category is not “Electronics”:

   SELECT *
   FROM products
   WHERE NOT category = 'Electronics';

2. Retrieve customers who do not have an email address:

   SELECT *
   FROM customers
   WHERE NOT email IS NOT NULL;

3. Find employees who do not work in the “Sales” department:

   SELECT *
   FROM employees
   WHERE NOT department = 'Sales';

The NOT operator is handy when you want to exclude rows that meet a specific condition. It is especially useful when you need to negate conditions in your SQL queries to filter out data that doesn’t meet certain criteria.