postgresqlHow to use the NOT IN operator in PostgreSQL?

The NOT IN operator in PostgreSQL is used to test if a value is not present in a list of values. This operator is used in the WHERE clause of a SELECT, UPDATE, or DELETE statement.

For example, if you want to select all customers who are not in the list of specified cities, you could use the following code:

SELECT *
FROM customers
WHERE city NOT IN ('New York', 'Los Angeles', 'Chicago');

This statement will return all customers who are not from the cities of New York, Los Angeles, or Chicago.

The parts of the code are:

• SELECT * - This statement is used to select all columns from the customers table.
• FROM customers - This statement specifies the table from which to select the data.
• WHERE city NOT IN ('New York', 'Los Angeles', 'Chicago') - This statement is used to filter out all customers who are not from the specified cities.

Helpful links

• PostgreSQL Documentation
• W3Schools PostgreSQL Tutorial

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