SQL Server：移动平均计算


SQL Server : moving average calculation

我有一个脚本可以根据过去 3 个月计算移动平均值。

是否可以修改此移动平均线以仅显示第 4 个月的值？或者当我想基于 4 个月计算时，显示第 5 行的值，依此类推...

因此，当我有足够的数据进行计算时，仅显示该月的值。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
SELECT
    [Brand], [month],
    CAST(SUM([Volume]) AS INT) AS [Volume (t)],
    AVG(CAST(SUM([Volume]) AS INT)) OVER (PARTITION BY [Brand]) AS [Average (t)],
    AVG(CAST(SUM([Volume]) AS INT)) OVER (PARTITION BY [Brand] ORDER BY [month] ROWS BETWEEN 3 PRECEDING AND 1 PRECEDING) AS [Moving Average (3)]
FROM
    dw_lc_full_aggregated_1
WHERE  
    [year] = 2016 AND
    [month] BETWEEN 1 AND 9 AND
    [Navision Source] = 'HU' AND
    [Brand] = 'xxxxxxx'
GROUP BY
    [Brand], [month]
相关讨论

谢谢！我解决了它如下：

1
2
3
4
5
6
7
8
9
10
SELECT  [Brand],
        [month],
        cast(sum([Volume]) AS INT) as [Volume (t)],
        AVG(cast(sum([Volume])AS INT)) OVER (PARTITION BY [Brand]) AS [Average (t)],

        CASE WHEN (Row_Number() OVER (ORDER BY [month]))>3
        THEN AVG(cast(sum([Volume])AS INT))
                    OVER (PARTITION BY [Brand] ORDER BY [month] ROWS BETWEEN 3 PRECEDING AND 1 PRECEDING)
                    ELSE NULL END AS [Moving Average (3)]
............