如何找到最大平均 [英] How to find maximum avg

问题描述

我正在尝试显示最高平均工资；但是，我似乎无法使其正常工作.

I am trying to display the maximum average salary; however, I can't seem to get it to work.

我可以获得要显示的平均薪水列表:

I can get a list of the average salaries to display with:

select worker_id, avg(salary)
from workers
group by worker_id;

但是，当我尝试显示带有以下项的最高平均工资列表时:

However, when I try to display a list of the maximum average salary with:

select max (avg(salary))
from (select worker_id, avg(salary)
      from workers
      group by worker_id);

它没有运行.我收到无效标识符"错误.如何使用每个工人的平均工资来查找每个工人的最高平均工资?

it doesn't run. I get an "invalid identifier" error. How do I use the average salary for each worker to find the maximum average for each worker?

谢谢.

推荐答案

聚合函数(例如avg)产生的列通常会获得任意名称.只需为其使用别名，然后在其上进行选择:

Columns resulting from aggregate functions (e.g. avg) usually get arbitrary names. Just use an alias for it, and select on that:

select max(avg_salary)
from (select worker_id, avg(salary) AS avg_salary
      from workers
      group by worker_id) As maxSalary;

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