UPDATE access SET userid = X WHERE userid = Y;
UPDATE administrator SET userid = X WHERE userid = Y;
UPDATE adminlog SET userid = X WHERE userid = Y;
UPDATE announcement SET userid = X WHERE userid = Y;
UPDATE attachment SET userid = X WHERE userid = Y;
UPDATE calendarmoderator SET userid = X WHERE userid = Y;
UPDATE customavatar SET userid = X WHERE userid = Y;
UPDATE customprofilepic SET userid = X WHERE userid = Y;
UPDATE deletionlog SET userid = X WHERE userid = Y;
UPDATE editlog SET userid = X WHERE userid = Y;
UPDATE event SET userid = X WHERE userid = Y;
UPDATE moderator SET userid = X WHERE userid = Y;
UPDATE moderatorlog SET userid = X WHERE userid = Y;
UPDATE passwordhistory SET userid = X WHERE userid = Y;
UPDATE pm SET userid = X WHERE userid = Y;
UPDATE pmreceipt SET userid = X WHERE userid = Y;
UPDATE pmreceipt SET touserid = X WHERE touserid = Y;
UPDATE pmtext SET fromuserid = X WHERE fromuserid = Y;
UPDATE pollvote SET userid = X WHERE userid = Y;
UPDATE post SET userid = X WHERE userid = Y;
UPDATE posthash SET userid = X WHERE userid = Y;
UPDATE reminder SET userid = X WHERE userid = Y;
UPDATE reputation SET userid = X WHERE userid = Y;
UPDATE search SET userid = X WHERE userid = Y;
UPDATE subscribeevent SET userid = X WHERE userid = Y;
UPDATE subscribeforum SET userid = X WHERE userid = Y;
UPDATE subscribethread SET userid = X WHERE userid = Y;
UPDATE subscriptionlog SET userid = X WHERE userid = Y;
UPDATE thread SET postuserid = X WHERE postuserid = Y;
UPDATE threadrate SET userid = X WHERE userid = Y;
UPDATE user SET userid = X WHERE userid = Y;
UPDATE userfield SET userid = X WHERE userid = Y;
UPDATE usergroupleader SET userid = X WHERE userid = Y;
UPDATE usergrouprequest SET userid = X WHERE userid = Y;
UPDATE usernote SET userid = X WHERE userid = Y;
UPDATE usertextfield SET userid = X WHERE userid = Y;