Question

我在sql查询中遇到一个问题，这是我尝试的解决方案：

CREATE TABLE #EventTable(eStartDate datetime,eEndDate datetime)
insert into #EventTable VALUES('2014-10-21 10:57:48.603','2014-10-22 10:57:48.603')
insert into #EventTable VALUES('2014-10-23 10:57:48.603','2014-10-23 10:57:48.603')
insert into #EventTable VALUES('2014-10-25 10:57:48.603','2014-10-27 10:57:48.603')
insert into #EventTable VALUES('2014-10-28 10:57:48.603','2014-10-30 10:57:48.603')
insert into #EventTable VALUES('2014-10-31 10:57:48.603','2014-11-02 10:57:48.603')

第二张表

CREATE TABLE #NeedDateTable(StartDate datetime,EndDate datetime)
insert into #NeedDateTable VALUES('2014-10-22 10:57:48.603','2014-10-26 10:57:48.603')
insert into #NeedDateTable VALUES('2014-11-23 10:57:48.603','2014-11-23 10:57:48.603')
insert into #NeedDateTable VALUES('2014-11-02 10:57:48.603','2014-11-03 10:57:48.603')

SELECT * from #EventTable
SELECT * from #NeedDateTable

我想从#NeedDateTable返回与#EventTable重叠的日期。所以在我的情况下它应该返回两个日期“ 2014-10-22 10：57：48.603 ＆amp;＆amp; 2014-10-26 10：57：48.603 ”和 “ 2014-11-02 10：57：48.603 ＆amp;＆amp; 2014-11-03 10：57：48.603 ”

这是我的查询

SELECT Startdate , EndDate 
FROM #NeedDateTable a,#EventTable b  
WHERE ((a.Startdate <= b.eStartDate and b.eStartDate<= a.EndDate) 
OR (a.Startdate <= b.eEndDate and b.eEndDate <= a.EndDate))

它返回上述日期的重复记录。你能帮我解决一下我的问题。

Answer 1

查询

SELECT a.StartDate,a.EndDate
FROM NeedDateTable a
INNER JOIN
EventTable b
ON a.StartDate=b.eStartDate
OR a.StartDate=b.eEndDate
OR a.EndDate=b.eStartDate
OR a.EndDate=b.eEndDate;

Fiddle Demo

Answer 2

我在你输出中看到你想要有StartDate = EventTable的eEndDate的NeedDateTable记录。如果是这种情况，那么这里是查询：

select a.* from NeedDateTable a join  EventTable b 
on a.StartDate = b.eEndDate;

如果你想返回NeedDateTable的记录，其中存在一个记录在EventTable中，其estartdate或eenddate位于NeedDateTable的startdate和end date之间，那么：

select * from NeedDateTable a 
where exists 
(
  select 1 from EventTable b 
  where (b.eStartDate between a.StartDate and a.EndDate) or
  (b.eEndDate between a.StartDate and a.EndDate)
);

sample sql fiddle

Answer 3

尝试将其添加到测试表中：

insert into #EventTable VALUES('2015-05-10','2015-05-10')
insert into #EventTable VALUES('2016-05-10','2016-05-13')
insert into #NeedDateTable VALUES('2015-05-10','2015-05-10')
insert into #NeedDateTable VALUES('2016-05-11','2016-05-12')

两个示例都会重叠，但其他答案目前无法确定其中一个重叠。

以下是检测重叠的方法：

SELECT * FROM #NeedDateTable a 
WHERE exists 
(
  SELECT null FROM #EventTable b 
  WHERE 
    a.StartDate <= b.eEndDate and
    a.EndDate >= b.eStartDate
);

Answer 4

在查询中使用Simple Between语句

SELECT  Startdate,
        EndDate
    FROM    #NeedDateTable a cross join
            #EventTable b
    WHERE   a.Startdate BETWEEN b.eStartdate AND b.eEndDate
            OR a.EndDate BETWEEN b.eStartdate AND b.eEndDate

如何比较一个表与另一个表的日期

4 个答案:

查询

Fiddle Demo