AVG生長使用查詢SQL

Question

我有如下表：

請幫我用下面的查詢在SQL： 「AVG（VALUE2 /值1，值3 /值2，值4 /值3） 「

非常感謝！

Answer 1

對於SQL Server 2008或更高版本;

; WITH CTE AS 
(
SELECT *, LAG(VALUE) OVER(ORDER BY MONTH) AS XX FROM YOURTABLE 
) 
SELECT AVG(CAST(VALUE AS FLOAT)/CAST(XX AS FLOAT)) FROM CTE WHERE XX IS NOT NULL 

Answer 2

試試這個：

SELECT AVG(Calc) 
FROM 
(
    SELECT t2.Value/t1.Value AS Calc 
    FROM [Table] t1 
    JOIN [Table] t2 
    ON t1.[Month] = t2.[Month] + 1 
) calc 

Answer 3

試試下面的查詢。

  select avg(CAST(a.value as FLOAT)/cast(a.mm as FLOAT)) from 
      (
      SELECT *, LAG(value) OVER(ORDER BY MONTH) AS mm FROM #your_table 
      ) 
      a where a.mm is not null 

請讓我們知道如果u有一個顧慮

Answer 4

我想用查詢SQL爲：

如果我選擇月= 3 =>結果= AVG（VALUE2 /值1，值3/VALUE2 ）-1-

如果我選擇一個月= 4結果= AVG（VALUE2 /值1，值3 /值2，值4 /值3）-1

由於