I tried everything.
When the subtract of SQL is negative, an abnormal value is returned.
db.executeQuery("UPDATE `players` SET `exphist7`=`exphist6`, `exphist6`=`exphist5`, `exphist5`=`exphist4`, `exphist4`=`exphist3`, `exphist3`=`exphist2`, `exphist2`=`exphist1`...