<p>While trying to make an update to the MySQL server, I accidentally forgot to add an extra WHERE clause that was supposed to edit a row. </p> <p>More than 3500 lines have now been edited due to my mistake. </p> <p>I may have a backup, but I've done a lot of work since the last backup and I don't want to waste all that work because of one bad query. </p> <p>Please tell me if there is any way to solve this problem. </p>