How to resolve the issue of invalid MySQL comment insertion?

If adding comments in MySQL is not working, there are several possible solutions that can be tried.

1. Ensure the correct format of comments: In MySQL, comments should begin with “/” and end with “/”, or begin with “–“.
2. Check the position of the comments: They should be at the end of the line or on the next line, not in the middle of the sentence or at the beginning of the line.
3. Check the database version: Some older versions of MySQL may have issues with invalid comment additions, upgrading to the latest version of MySQL can solve this problem.
4. Check the database configuration: Sometimes, the configuration file of MySQL may disable the comment feature. You can check if the “sql-mode” parameter exists in the my.cnf or my.ini file and ensure that there is no configuration disabling comments.
5. Check the query statement: Some query statements may not support comments, such as DDL statements (such as CREATE, ALTER, DROP, etc.). In this situation, comments cannot affect the query results.

If none of the above methods work, the invalid comments may be caused by other reasons. You can try reinstalling MySQL or consult the official MySQL technical support for further assistance.