SQL Server日期時間篩選查詢

Question

我有這個疑問在SQL Server：

此查詢的

SELECT 
    [Order Date], SUM([Profit]) 
FROM 
    [sample].[dbo].[superstore] 
WHERE 
    [Order Date] BETWEEN '2012-06-21 00:00:00.000' AND '2012-09-21 23:59:59.999' 
GROUP BY 
    [Order Date] 
ORDER BY 
    [Order Date]; 

結果有紀錄的2012-06-21 00:00:00.000

[訂購日期]，但與此查詢

SELECT 
    [Order Date], SUM([Profit]) 
FROM 
    [sample].[dbo].[superstore] 
WHERE 
    [Order Date] BETWEEN '2012-06-21 00:00:00.000' AND '2012-09-21 23:59:59.998' 
GROUP BY 
    [Order Date] 
ORDER BY 
    [Order Date]; 

我沒有得到這個記錄。

SQL Server是否有任何缺少的屬性？

提示：類型[Order Date]是datetime。

Answer 1

SQL Server日期/時間列的精度取決於確切的類型。在你的第一個，「0.999」正在四捨五入。

最安全的方法是避開between和時間成分，具有類似：

SELECT [Order Date] , sum([Profit]) 
FROM [sample].[dbo].[superstore] 
WHERE [Order Date] >= '2012-06-21' AND 
     [Order Date] < '2012-09-22' 
GROUP BY [Order Date] 
ORDER BY [Order Date]; 

Answer 2

使用BETWEEN操作日期範圍起初似乎吸引人，但正如你發現了，這是一個頭疼。如果你堅持以下格式，你會發現它不管日期/時間數據類型。

注：凡之間的邏輯> =和< =，我們的轉移「的最後一天，到次日午夜

SELECT 
    [Order Date], SUM(Profit) 
FROM 
    sample.dbo.superstore 
WHERE 
    [Order Date] >= '2012-06-21' 
    AND [Order Date] < '2012-09-22' 
GROUP BY 
    [Order Date] 
ORDER BY 
    [Order Date]; 

Answer 3

使用下面的查詢

SELECT 
    CAST([Order Date] AS date), 
    SUM([Profit]) 
FROM [sample].[dbo].[superstore] 
WHERE CAST([Order Date] AS date) BETWEEN '2012-06-21' AND '2012-09-21' 
GROUP BY CAST([Order Date] AS date) 
ORDER BY CAST([Order Date] AS date);