MySQL - Comments

In this article, we would like to show you how to use comments in MySQL.

Quick solution:

-- Single-line comment

/* 
  Multi-line
  comment
*/

Practical examples

Example 1

In this example, we use a single-line comment as a code fragment explanation:

-- Select all users
SELECT * FROM `users`;

Example 2

In this we use a single-line comment to ignore a statement at the end of the line:

SELECT * FROM `users` -- WHERE `name`='Tom';

Example 3

In this example we use a multi-line comment as a code fragment explanation:

/* Select all
 from the `users` table: */
SELECT * FROM `users`;

Example 4

In this example, we use a multi-line comment to ignore many statements:

/*SELECT * FROM `users`;
SELECT * FROM `products`;
SELECT * FROM `orders`;*/
SELECT * FROM `departments`;

Example 5

In this example, we use a multi-line comment to ignore part of a line:

SELECT `name`, /*`surname`*/ `country` FROM `users`;