Comments in MySQL

In MySQL, comments are used to add notes or explanations to your code. Comments can help you and other developers understand your code and make it more readable. In this tutorial, we'll discuss how to add comments in MySQL.

Syntax

There are two types of comments in MySQL:

• Single-line comments: These begin with two hyphens (--)
• Multi-line comments: These begin with /* and end with */

-- This is a single-line comment

/* This is a
   multi-line comment */

Example

Let's say we have a table called "users" and we want to add a comment to one of the columns:

CREATE TABLE users (
  id INT PRIMARY KEY,
  name VARCHAR(50), -- This column stores the user's name
  email VARCHAR(50) -- This column stores the user's email address
);

In the example above, we added a single-line comment to the "name" column to explain what data it stores.

Output

There is no output for comments in MySQL. They are ignored by the database server and are only there for readability and documentation purposes.

Explanation

Comments are used in MySQL to add notes or explanations to your code. They are ignored by the database server and do not affect the functionality of your code. Comments can make your code more readable and understandable for you and other developers.

Use

Comments are useful when:

• you need to explain a particular section of your code
• you need to leave a note for yourself or other developers
• you want to temporarily disable a section of your code without deleting it

Important Points

• Single-line comments begin with two hyphens (--).
• Multi-line comments begin with /* and end with */.
• Comments are ignored by the database server and do not affect the functionality of your code.

Summary

In this tutorial, we discussed how to add comments in MySQL. Comments are an important tool for making your code more readable and understandable for you and other developers. Knowing how to use comments effectively in your code can make your development process smoother and more efficient.