Question

获取SQL的最近30天非常简单

SELECT * FROM [myDB].[dbo].[myTable] 
WHERE [CreatedDate] >= DATEADD(day,-30,GETDATE()) 
and [CreatedDate] <= getdate()

但是我现在正在尝试获取前30天

SELECT * FROM [myDB].[dbo].[myTable] 
WHERE [CreatedDate] >= DATEADD(day,-30,GETDATE()) 
and [CreatedDate] <= DATEADD(day,-60,GETDATE())

这不起作用。对我来说，我看不出过去30天如何工作，但过去30天却无法工作？我必须在这里做些愚蠢的事情，有人能说明我做错了什么吗？

Answer 1

您需要撤消日期范围：

SELECT * FROM [myDB].[dbo].[myTable] 
WHERE [CreatedDate] >= DATEADD(day,-60,GETDATE()) 
and [CreatedDate] <= DATEADD(day,-30,GETDATE());

Answer 2

您必须更改比较

SELECT * FROM [myDB].[dbo].[myTable] 
WHERE [CreatedDate] >= DATEADD(day,-60,GETDATE()) and 
[CreatedDate] <= DATEADD(day,-30,GETDATE())

Answer 3

以下是解决现有答案的一些替代方法：

/* this is probably my favorite of the options, very little code and would be easy to parameterize the day range */
SELECT * FROM [myDB].[dbo].[myTable] 
WHERE DATEDIFF(DAY, cast([CreatedDate] as date), cast(GETDATE() as date)) BETWEEN 30 and 60

/* casting as date will remove the need to worry about time of day */
SELECT * FROM [myDB].[dbo].[myTable] 
WHERE cast([CreatedDate] as date) between dateadd(day, -60, cast(getdate() as date))
                                      and dateadd(day, -30, cast(getdate() as date))

过去30天的数据有效，但过去30天的数据无效吗？

3 个答案: