mysql group by column1,column2 'Desc\|asc' 没有报错

Question

当我在那里运行下面的查询没有错误时，结果如何。请注意查询中的 DESC。

select date(created) date,
       count(distinct some_id) subsccount,
       type
    from  sometable
    group by date,type DESC
    limit 5

Answer 1

作为 select syntax 上的 MySQL 文档说:

MySQL extends the GROUP BY clause so that you can also specify ASC and DESC after columns named in the clause:

SELECT a, COUNT(b) FROM test_table GROUP BY a DESC;