626. 换座位

626. 换座位

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题目链接：626. 换座位

代码如下：

# Write your MySQL query statement below
select 
    if(id%2=0,
        id-1,
        if(id=(select count(distinct id) from seat),
            id,
            id+1)
    )as id,
    student
from Seat
order by id asc