日期范围之间的SQL返回错误结果

Question

我正在编写SQL查询以获取日期范围格式之间的行：mm / dd / yyyy

我使用了between运算符，但结果显示超出范围日期

Select Internship_StartDate1
From [Media_BPM].[dbo].[BP_UGME]
Where TrainingType = 'Medical Internship Training'
  and Internship_StartDate1 Between '01/%/2020%'  AND '06/%/2020%'
Order By Internship_StartDate1 desc

预期结果：仅2020年日期

实际结果是：

Internship_StartDate1
05/16/2018
05/06/2018
05/05/2019
05/05/2019
05/02/2019
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Answer 1

我假设您使用SQL Server。在这种情况下，您可能认为%是通配符，表示任何字符，但事实并非如此。您可以将%与运算符LIKE一起使用，但不能与BETWEEN一起使用。使用功能FORMAT()：

FORMAT()

Answer 2

仅设置日期时间的格式

Select Internship_StartDate1 
from [Media_BPM].[dbo].[BP_UGME] 
where TrainingType = 'Medical Internship Training' 
AND FORMAT(Internship_StartDate1, 'yyyyMM') Between '202001' AND '202006' 
Order By Internship_StartDate1 desc

WHERE TrainingType ='医学实习培训''2019'和'2020'之间的AND年（转换（日期，实习开始日期1,103））按Internship_StartDate1 desc排序

Answer 3

您显然将 Select Internship_StartDate1 from [Media_BPM].[dbo].[BP_UGME] 通配符与其他比较混淆。 LIKE仅适用于'%'和LIKE。

更重要的是，对日期使用日期比较！这对于优化非常重要。您应该将条件写为：

NOT LIKE

对于这种比较，无需将日期转换为字符串。直接比较允许：

• 将日期转换为字符串会在处理的每一行上产生开销。
• 查询优化器以选择适当的索引，如果可用。
• 查询优化器以选择适当的分区，如果可用。
• 查询优化器选择合适的算法，因为大小统计信息可能更准确。

Answer 4

我只想补充一点，我最终在我的SQL代码中使用了YYYYMMDD，因为即使不进行格式化，这似乎也总是可以工作，并且相信我在MDY（MS默认）和DMY（例如，德国）很多。因此，对于整个2020年，我会这样搜索：

select Internship_StartDate1
from [Media_BPM].[dbo].[BP_UGME]
where TrainingType = 'Medical Internship Training' and
      Internship_StartDate1 >= '2020-01-01' and
      Internship_StartDate1 < '2020-07-01'
order by Internship_StartDate1 desc;