使用查询SQL增加AVG

Question

我有下表：

请帮我在SQL中使用以下查询：  “AVG（VALUE2 /值1，值3 /值2，值4 /值3）”

非常感谢！

Answer 1

对于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

试试这个：

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

尝试以下查询。

            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

如果您有疑虑，请告诉我们

Answer 4

我想使用查询SQL：

如果我选择month = 3 =＆gt; result = AVG（value2 / value1，value3 / value2）-1

如果我选择month = 4 result = AVG（value2 / value1，value3 / value2，value4 / value3）-1

谢谢