38 - 换座位

-- 方法一
select(casewhen id%2=1 and id=(select max(id) from seat) then idwhen id%2=0 then id-1else id+1end) as id, student
fromseat
order byid;-- 方法二selectif(id%2=0,id-1,if(id=(select max(id) from Seat),id,id+1)) as id,student
fromSeat
order by id;