Mysql,order by 聚合函数 别名

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select   id2,sum(num1)  from   table1
where id1 = '123'
group by id2
order by sum(num1) 

select   id2,sum(num1) as sum_num1   from   table1
where id1 = '123'
group by id2
order by sum_num1

select   id2,sum(num1) sum_num1   from   table1
where id1 = '123'
group by id2
order by sum_num1

以上这三条查询语句的结果一样，

order by 某个聚合函数结果时，可以直接 order by 别名 ，这样更方便