SQL Server日期时间筛选查询

Question

我有这个疑问在SQL Server：

此查询的

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]; 

结果有纪录的2012-06-21 00:00:00.000

[订购日期]，但与此查询

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]; 

我没有得到这个记录。

SQL Server是否有任何缺少的属性？

提示：类型[Order Date]是datetime。

Answer 1

SQL Server日期/时间列的精度取决于确切的类型。在你的第一个，“0.999”正在四舍五入。

最安全的方法是避开between和时间成分，具有类似：

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操作日期范围起初似乎吸引人，但正如你发现了，这是一个头疼。如果你坚持以下格式，你会发现它不管日期/时间数据类型。

注：凡之间的逻辑> =和< =，我们的转移“的最后一天，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

使用下面的查询

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);