Question

我一直在尝试计算sql server中的移动平均值超过60个值，但我没有成功，希望你们帮帮我。

请查看以下数据

User       startdate           Enddate           minutes     moving average 
Sync    3/15/2014 10:00     3/15/2014 11:47      107         113.4117647 
Sync    3/15/2014 12:00     3/15/2014 13:45      105         112.8627451
Sync    3/15/2014 14:00     3/15/2014 15:41      101         112.5490196
Sync    3/15/2014 16:00     3/15/2014 17:12      72          112.372549
Sync    3/16/2014 1:00      3/16/2014 1:00       0           112.372549
Sync    3/16/2014 2:00      3/16/2014 2:00       0           112.372549

要求查询不得考虑零的行，即使它应该在表中显示，上面的最后一列除了平均值。

Answer 1

试试这个。我不确定你是如何获得你在网格中放置的那些移动平均值，而我假设它们是由于之前没有显示的值。

DECLARE @table TABLE (
[User] NVARCHAR(10),
[StartDate] DATETIME,
[EndDate] DATETIME,
[Minutes] FLOAT,
[Average] FLOAT
)

INSERT INTO @table ([User],[startdate],[Enddate],[minutes]) VALUES 
('Sync','3/15/2014 10:00','3/15/2014 11:47',107.0),
('Sync','3/15/2014 12:00','3/15/2014 13:45',105.0),
('Sync','3/15/2014 14:00','3/15/2014 15:41',101.0),
('Sync','3/15/2014 16:00','3/15/2014 17:12',72.0),
('Sync','3/16/2014 1:00','3/16/2014 1:00',0.0),
('Sync','3/16/2014 2:00','3/16/2014 2:00 ',0.0)

UPDATE t
SET [Average] = [avg]
FROM @table t
INNER JOIN (
  SELECT  
    [startdate],
    AVG(NULLIF([Minutes],0)) OVER (PARTITION BY [User]  ORDER BY [startdate]) [avg]
  FROM
    @table
) a ON a.StartDate = t.StartDate

SELECT * FROM @table

让我知道你是怎么过的。

斯图尔特

将计算移动平均值的SQL查询必须排除零值行

1 个答案: