sql-server - 在 sql server 中过去 7 天的最佳方法是什么？

Question

我需要过去 24 小时 7 天的结果。我想要的结果需要采用这种格式:

2011-11-05   11 orders  $12354.94
2011-11-04   12 orders  $12555.72
2011-11-03   5 orders  $1000.24

在尝试一些查询时，我不断返回不同数量的行。例如，这个查询:

SELECT CAST(Left(OrderDate,10) as smalldatetime) as PurchaseDate,
       COUNT(Orders.WebOrderNumber) as "Rows",
       SUM(cast(Orders.Total_Lines_Net AS money)) as Total
FROM Orders 
WHERE OrderDate  BETWEEN getdate() - 7 AND getdate() 
GROUP BY cast(Left(OrderDate,10) as smalldatetime)
ORDER BY cast(Left(OrderDate,10) as smalldatetime)

返回此数据:

   PurchaseDate Rows    Total
2011-12-01 00:00:00 1539    404798.85
2011-12-02 00:00:00 1572    324963.604
2011-12-03 00:00:00 970 119244.93
2011-12-04 00:00:00 1092    120888.244
2011-12-05 00:00:00 1201    337646.952
2011-12-06 00:00:00 1309    287609.243
2011-12-07 00:00:00 1555    315223.22

我认为 12 月 1 日的行看起来很低，所以我尝试了一个不同的查询:

SELECT   SUM(cast(Orders.Total_Lines_Net AS money)) as Total,
         COUNT(Orders.WebOrderNumber) as "Rows",
         CAST(Left(OrderDate,10) as smalldatetime) as PurchaseDate
FROM Orders 
WHERE OrderDate between '2011-12-01 00:00:00' AND  + '2011-12-01 23:59:59'
GROUP BY cast(Left(OrderDate,10) as smalldatetime)

返回 2597 行。第一个查询没有返回完整的 24 小时周期吗？此数据库中的日期字段是 varchar(255) , 其中包含日期、小时、分钟和秒。这样做的正确方法是什么？

Answer 1

;WITH [cteOrders] AS
(
    SELECT  CONVERT(DATE, [OrderDate]) AS [OrderDate],
            CONVERT(MONEY, [Total_Lines_Net]) AS [Total_Lines_Net]
    FROM [dbo].[Orders]
)
SELECT  [OrderDate],
        COUNT(*) AS [Rows],
        SUM([Total_Lines_Net]) AS [Total]
FROM [cteOrders]
WHERE DATEDIFF(DAY,[OrderDate],GETDATE()) <= 7
GROUP BY [OrderDate]
ORDER BY [OrderDate]