How to Comment in MySQL - (MySQL Practicles)

In MySQL, you can add comments to your SQL queries or database structures. Comments are lines that are ignored by the MySQL server and are used to add notes, explanations, or other information to your code. In this tutorial, we'll show you how to add comments in MySQL.

Syntax

You can add comments in MySQL using two different types of comment syntax: single-line comments and multi-line comments.

Single-Line Comment Syntax

Single-line comments in MySQL start with two hyphens (--). Everything after the double hyphens on the same line is ignored by the MySQL server.

-- This is a single-line comment in MySQL
SELECT * FROM customers;

Multi-Line Comment Syntax

Multi-line comments in MySQL start with a forward slash and asterisk (/) and end with an asterisk and forward slash (/). Everything between the opening and closing delimiters is ignored by the MySQL server.

/* This is a multi-line
   comment in MySQL */
SELECT * FROM orders;

Example

Let's say we want to add a comment to a SQL query that gives information about our customers. Here's how we can implement it:

SELECT * FROM customers -- This is a comment about the query

In the example above, we added a single-line comment after the SQL statement that tells us what the query does.

Output

When we run the example code above in a MySQL terminal or tool, the comment is ignored, and we get the expected output of the SQL query.

Explanation

Comments in MySQL are lines that are ignored by the MySQL server and are used to add notes, explanations, or other information to your code. You can add single-line or multi-line comments to your SQL queries or database structures.

Use

Comments in MySQL are useful for documenting your code, adding notes or reminders, or temporarily disabling parts of your code for testing purposes. They can also make your code more readable and maintainable, especially for complex queries.

Important Points

• Single-line comments in MySQL start with two hyphens (--) and end at the end of the line.
• Multi-line comments in MySQL start with a forward slash and asterisk (/) and end with an asterisk and forward slash (/).
• Comments in MySQL are ignored by the MySQL server and are used to add notes, explanations, or other information to your code.

Summary

In this tutorial, we showed you how to add comments in MySQL using single-line and multi-line comment syntax. Comments in MySQL are lines that are ignored by the MySQL server and are used to add notes, explanations, or other information to your code. With this knowledge, you can now add comments to your SQL queries or database structures in MySQL to make your code more readable, maintainable, and informative.