您是否正在寻找这样的东西?
UPDATE textile_events e, (SELECT @n := 249) m SET e.seq_no = @n := @n + 1 WHERe e.eid = 'headsup' AND e.paid = 'paid'
SQLFiddle

您是否正在寻找这样的东西?
UPDATE textile_events e, (SELECT @n := 249) m SET e.seq_no = @n := @n + 1 WHERe e.eid = 'headsup' AND e.paid = 'paid'
SQLFiddle