sql语句怎么进行分组查询 SQL分组统计并排序？

SQL分组统计并排序？with tmp as(select row_number() over(order by count(val)) as rn，val，count(val) as cnum fr

SQL分组统计并排序？

with tmp as

(select row_number() over(order by count(val)) as rn，val，count(val) as cnum from table1 group by val)

select * from tmp where rn

要想区别并列现象还要复杂一些，可能简单的语句解决不了

sql同一个字段先分组再排序？

应该是先筛选比较好，会减少分组的运算量。 sql 默认的优先级是 from>where>group by>select>order by where在group by 前执行，会减少group by 的运算量。

oracleSQL用select过程进行分组排序查询？

实现思路：通过select进行查询，通过group by进行分组后，之后通过order by进行排序。sql：select username from tablename order by username desc group by username以上就是通过username字段降序排序（升序是ASC、降序是DESC）。