The user specified as a definer ('yhz'@'%') does not exist

The error message "The user specified as a definer ('yhz'@'%') does not exist" indicates that there is an issue with the user specified in a SQL statement. It seems that the user 'yhz' does not exist in the database or has been removed.

To resolve this issue, you can try the following steps:

1. Check the spelling and capitalization of the user name. Make sure it is correct.
2. Verify if the user 'yhz' exists in the database. You can use the following SQL command to check:

   SELECT user, host FROM mysql.user WHERE user = 'yhz';

If the user does not exist, you will need to create it using the appropriate SQL command.
3. If the user exists, but you are still getting the error, it is possible that the user's privileges have been revoked or modified. In this case, you may need to grant necessary privileges to the user using the GRANT statement.

For example, if you want to grant all privileges to the user 'yhz', you can use the following SQL command:

   GRANT ALL PRIVILEGES ON *.* TO 'yhz'@'%';   ```

   Make sure to replace '*' with the appropriate database and table names if you want to limit the privileges to specific databases or tables.

By following these steps, you should be able to resolve the "user specified as a definer does not exist" error.