SQL 查询开始日期和结束日期的混淆

Question

我有一个像这样的表格(例如tableA):

| Name  | Startdate  |  Enddate   ||---------------------------------||  a    | 2012-07-01 | 2013-06-30 ||  b    | 2011-05-01 | 2012-04-30 ||  c    | 2010-01-01 | 2013-12-31 ||  d    | 2013-01-01 | 2014-12-31 ||  e    | 2011-07-01 | 2012-06-30 |

I want to get a name from the table who is active between 2012-05-01 and 2012-10-31. From above table the result should be a,c and e.

What I have done is as following:

SELECT Name FROM tableA WHERE startdate<='2012-05-01' AND enddate>='2012-10-31'

但我没有得到正确的结果。

Answer 1

declare @T table
(
  Name char(1),
  Startdate datetime,
  Enddate datetime
)

insert into @T values
('a',     '20120701',  '20130630'), 
('b',     '20110501',  '20120430'), 
('c',     '20100101',  '20131231'), 
('d',     '20130101',  '20141231'), 
('e',     '20110701',  '20120630')

declare @StartDate datetime = '20120501'
declare @EndDate datetime = '20121031'

select Name
from @T 
where Startdate < @EndDate and
      Enddate > @StartDate