Thread:Project:Support desk/Database error (6)/reply

Are you really sure that the wiki is using the same database, meaning the one, on which you tried running the SELECT query? Or are you maybe unintendedly using a test instance or so at one place?

If this is not the problem, then it might be that the MySQL server was updated or the database files were moved. If that is the case, restarting the MySQL service and/or recreating the database should help.