28 - 只出现一次的最大数字（高频 SQL 50 题基础版)

28 - 只出现一次的最大数字

select 
    (select
        num
    from
        MyNumbers 
    group by
        num 
    having
        count(num)=1
    order by 
        num 
    desc limit 
        1) 
as 
    num;