How to resolve the issue of not being able to use MySQL temporary tables?

If temporary tables in MySQL are not working, it could be due to several reasons:

1. Insufficient permissions: Make sure you have the necessary permissions to create temporary tables. You can try using the SHOW GRANTS statement to view your permissions.
2. Temporary table space insufficient: Check if your MySQL server has enough temporary table space, try cleaning some temporary files or expanding the temporary table space.
3. If a temporary table already exists with the same name, it may prevent the creation of a new temporary table. Consider deleting the existing temporary table or using a different table name.
4. MySQL configuration issue: Ensure that the configuration file for MySQL has correctly set parameters related to temporary tables, such as tmp_table_size and max_heap_table_size.

If the above methods do not solve the issue, it is recommended to restart the MySQL server or contact the database administrator for further troubleshooting and repairs.