IN - (PostgreSQL Conditions)

The IN condition is a PostgreSQL operator that allows you to check if a value is in a list of values. In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of the IN condition in PostgreSQL.

Syntax

value IN (value1, value2, ..., valuen)

The IN condition returns true if the value is in the list of values.

Example

Here's a simple example of using the IN condition in PostgreSQL:

SELECT *
FROM customers
WHERE country IN ('USA', 'Canada', 'Mexico');

This query would return all customers from the USA, Canada, and Mexico.

Explanation

In the above example, we used the IN condition to check if the country value for a customer is in a list of allowed countries. The query returns all customers whose country is either USA, Canada, or Mexico.

Use

The IN condition is useful for checking if a value is in a list of allowed values. It can also be used with subqueries to compare multiple values at once.

Important Points

• The IN operator is case-sensitive.
• The list of values must be a comma-separated list enclosed in parentheses.
• Subqueries can be used in place of the list of values.
• The NOT IN operator returns true if the value is not in the list of values.

Summary

In this tutorial, we discussed the IN condition in PostgreSQL. We covered its syntax, example, output, explanation, use, and important points. With this knowledge, you can now use the IN condition in your PostgreSQL queries to check if a value is in a list of allowed values.