NOT - (PostgreSQL Conditions)

In PostgreSQL, the NOT operator is used to negate a condition. It is used to perform logical negation on a given condition and return the opposite boolean value.

In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of the NOT operator in PostgreSQL.

Syntax

SELECT column1, column2
FROM table_name
WHERE NOT condition;

Example

Let's take an example to understand how the NOT operator works in PostgreSQL.

SELECT *
FROM employees
WHERE NOT age > 30;

In this example, the NOT operator is used to negate the condition age > 30. This query will return all the employees whose age is not greater than 30.

Explanation

The NOT operator is used to negate a given condition. It returns the opposite boolean value of the condition. When we use NOT with a condition, it will evaluate the condition to TRUE if it is false and vice versa.

In the above example, the condition age > 30 will return TRUE for all employees whose age is greater than 30. When we use NOT with this condition, it will return all employees whose age is not greater than 30.

Use

The NOT operator is used to perform logical negation on a given condition. It is used to filter out records from the table that do not meet the given condition.

Important Points

• The NOT operator can be used with any condition.
• When NOT is used with a NULL value, it will return NULL.
• The NOT operator is case-sensitive.

Summary

In this tutorial, we discussed the NOT operator in PostgreSQL conditions. We covered the syntax, example, output, explanation, use, and important points of the NOT operator. With this knowledge, you can now use the NOT operator to negate conditions and return the opposite boolean value in your PostgreSQL queries.