日期范围之间的SQL返回错误的结果

时间：2019-11-03 10:18:44

标签： sql sql-server

我正在编写一个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，但结果显示超出了日期范围

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：仅日期为2020年

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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4 个答案:

答案 0 :(得分：3)

我假设您使用的是SQL Server。
在这种情况下，也许您认为%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()：

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

答案 1 :(得分：1)

只需设置日期时间的格式

 Select Internship_StartDate1 from [Media_BPM].[dbo].[BP_UGME]

WHERE TrainingType ='医学实习培训'   '2019'和'2020'之间的AND YEAR（转换（日期，Internship_StartDate1,103））    通过Internship_StartDate1 desc订购

答案 2 :(得分：1)

您显然将LIKE通配符与其他比较混淆。 '%'仅适用于LIKE和NOT 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：

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;

进行此类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增加处理的每一行的开销。
  • 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）。
  • 查询优化器选择适当的算法，因为大小统计信息可能更准确。

答案 3 :(得分：1)

我只想补充一点，我最终在我的SQL代码中使用了YYYYMMDD，因为即使没有格式化，它（似乎）也总是可以工作，并且相信我在MDY（MS默认）与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
       --  first and last time tick in 2020
       Internship_StartDate1 between '20200101' and '20201231 23:59:59.997'
 order by Internship_StartDate1 desc
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