mysql 分组查询的结果当成临时表在求最大值

select avg(data1) as a from temp WHERE YEAR(mdate)= 2018 and MONTH(mdate)=03 and day(mdate)=25 GROUP BY hour(mdate);

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select MAX(s.a) from (select avg(data1) as a from temp WHERE YEAR(mdate)= 2018 and MONTH(mdate)=03 and day(mdate)=25 GROUP BY hour(mdate)) s;