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MySQL NOT Operator

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MySQL NOT Operator is one of the Logical Operator which is used in the WHERE Clause to apply filters on the rows returned by SELECT Statement. This operator returns the result as:

  • 1, if the operand is zero
  • 0, if the operand is 1.
  • NULL, If the operand is NULL.

In this article, we will show you, How to use the MySQL Logical Operator NOT in WHERE Clause to filter the data.

In order to explain the NOT operator, we are going to use the below shown data.

MySQL NOT Operator 0

MySQL NOT Operator – Command prompt

In this example we will pass Zeros, Ones, and Null values with different combination. This example helps you to understand the Truth table behind the NOT Operator.

-- NOT Operator in MySQL Example

SELECT NOT 1;

SELECT NOT 0;

SELECT NOT NULL;

SELECT !1;

SELECT !(1 - 1);

OUTPUT

MySQL NOT Operator Example 1

MySQL NOT Operator Example

The NOT Operator is used to test user specified condition in WHERE Clause.

-- MySQL NOT Operator Example
USE company;
SELECT CustID,
		First_Name, Last_Name,
        Education, Profession,
        Yearly_Income, Sales
FROM customers
WHERE Education != 'High School';

OUTPUT

MySQL NOT Operator Example 2

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