How to use in in mysql

MySQL's IN operator checks whether a column is contained in a specified list of values. Syntax: WHERE column_name IN (value1, value2, ..., valueN). Advantages include improved efficiency and simplified queries.

Usage of IN operator in MySQL

What is IN operator?

IN operator is used to check whether a column is contained in the list of specified values.

Syntax

<code class="sql">SELECT column_name
FROM table_name
WHERE column_name IN (value1, value2, ..., valueN);</code>

How to use the IN operator

1. Specify the columns to check:column_name specifies the column in which the value to be checked resides.
2. Specify a list of values: Inside the brackets is a list of values ​​that are the targets that the IN operator will check.

Example

<code class="sql">SELECT product_name
FROM products
WHERE product_category IN ('Electronics', 'Clothing', 'Furniture');</code>

This query will find all product names with the product category "Electronics", "Apparel", or "Furniture".

Advantages of the IN operator

• Improving efficiency: The IN operator can significantly improve performance because it requires only one query You can check multiple values ​​instead of executing a separate query for each value.
• Simplified queries: The IN operator makes queries easier to write and maintain, especially when dealing with large numbers of values.

Notes

• The values ​​in the value list must be of the same data type as the column to be checked.
• Values ​​in the value list must be separated by commas.
• The IN operator can check for null values, but cannot be used with NULL.

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