I noticed that a little while ago. Since I rarely go there, I didn't even think about posting it there. plus I wasn't sure that it was going to be a mysql question, to start with.
SELECT `referrerid`
FROM `user`
WHERE referrerid >0
If you're happy that the correct data has been called then do another query. This time, copy and paste the DELETE version which should call the same data and, hopefully, give you the option of deleting it.
DELETE `referrerid`
FROM `user`
WHERE referrerid >0
Later, you can do another query to determine who received the most referrals.
If i click execute sql query it gives an error message as "you are not authorized to execute sql queries". I am admin of this site, so what should i do to remove this error message.