This would be for users which don't have a setting (which is none, since you ran it before):
Code
UPDATE `forums_USER_PROFILE` SET `USER_FLOOD_CONTROL_OVERRIDE` = '-1' WHERE `forums_USER_PROFILE`.`USER_FLOOD_CONTROL_OVERRIDE` = '';

This would be for ALL users, regardless of if it's set or not:
Code
UPDATE `forums_USER_PROFILE` SET `USER_FLOOD_CONTROL_OVERRIDE` = '-1';

If you want the field to be blank, just update '-1' to ''.

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