SQL计算两个字段的平均值

Question

我有一个数据库表，它有三个相关的字段，首先是用户ID，然后一个是提交的节点数，另一个是每个节点“得分”的总和。

我需要能够运行一个查询，它将返回平均分数最高的用户，但我的SQL-fu不是它可能的位置。

干杯！

Answer 1

这就是你需要的。将int数据类型转换为处理小数的东西很重要，否则你会得到不准确的平均值：

SELECT *, CAST(total_score AS FLOAT) / CAST(total_nodes AS FLOAT) AS average_score
FROM yourtable
ORDER BY CAST(total_score AS FLOAT) / CAST(total_nodes AS FLOAT) DESC

祝你好运！

- 迈克尔

Answer 2

您在寻找

吗？

-- Multiplied by 1.0 to convert it to double
Select top 100 user_id, (1.0 * total_score/total_node) as AvgScore
From   YourTable
Order By (total_score/total_node) asc

Answer 3

SELECT AVG(user.score) AS avg_score 
FROM user 
GROUP BY user.id 
ORDER BY avg_score DESC 

Answer 4

试试这个：

select userid,max(avgscore) as maxscore
from 
(select userid,avg(score) as avgscore from usertable group by userid) mytab

Answer 5

Easer将是

SELECT AVG(user.score1 + user.score2)/2 as average, userid FROM usertable
GROUP BY userid
ORDER BY average

注意你的数据类型。如果分数是整数，您可能首先要将平均值转换为小数。