How do you add comments to fields in MySQL?

In MySQL, you can use the `ALTER TABLE` statement to add comments to fields. The steps to add comments to a field are as follows:

First, connect to the MySQL database and select the database to operate on.

Execute the following SQL statement to modify the table structure and add a comment using the `ALTER TABLE` and `MODIFY COLUMN` clauses. Replace `table_name` with the name of the table to be modified, `column_name` with the name of the field to add a comment to, and `comment` with the desired comment content.

ALTER TABLE table_name MODIFY COLUMN column_name datatype COMMENT 'comment';

For example, to add a comment to the field `name` in the table `users`, you can execute the following statement:

ALTER TABLE users MODIFY COLUMN name VARCHAR(50) COMMENT 'This field stores the 
user's name.';

The above statement will modify the ‘name’ field in the ‘users’ table and add a note saying “This field stores the user’s name.”

After executing the above statement, the comment for the field will be successfully added to the database.

Please note that depending on the version of MySQL and the client tool used, some tools may offer easier ways to add field comments. For example, in MySQL Workbench, you can directly add field comments through the table design view without writing SQL statements.