如何根据mysql中的值获取平均值

Question

根据他们的价值，我试图获取数据结果及其平均值，例如：

select sum(rank) as value,area from temp GROUP BY area

value | Area
------+-------
15    | East
54    | North
49    | South
35    | West

但我希望他们的总平均值

value | Area  | Average
------+-------+---------
49    | East  | 40
15    | North | 40
56    | South | 40
40    | West  | 40

我怎么能得到这些？请帮忙

Answer 1

您可以使用子查询。这会给你想要的结果吗？

select x.value, t.area
from temp t cross join
     (select sum(rank) / count(distinct area) as value from temp) x
group by t.area, x.value;

Answer 2

select sum(rank) as value, area, avg(value) from temp GROUP BY area