SQL計算兩個字段的平均值

Question

我有一個數據庫表，它有三個相關的字段，首先是一個用戶ID，然後一個是提交節點的數量，另一個是每個節點的「分數」的總和。

我需要能夠運行一個查詢，它將返回具有最高平均分數的用戶，但我的SQL-fu不是它的可能位置。

乾杯！

Answer 1

下面是你需要的。重要的是要投你的int數據類型的東西，處理小數是很重要的，否則你會得到不準確的場均數據：

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 

祝你好運！

-Michael

Answer 2

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

Answer 3

試試這個：

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

Answer 4

Easer將

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

注意你的數據類型。如果分數是整數，您可能首先要將平均值轉換爲小數。

Answer 5

你是正在尋找

-- 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