Question

我有一个包含团队名称的表格，团队创建的日期以及团队解散的日期：

TeamName                                TeamStartDate           TeamEndDate
Business Analysis                       2012-12-31 00:00:00.000 2013-06-30 00:00:00.000
Business Systems                        2012-06-18 00:00:00.000 2015-01-31 00:00:00.000
Business Systems and Portfolio          2012-12-31 00:00:00.000 2099-12-31 00:00:00.000
Data Administration/eCommerce/Testing   2012-10-29 00:00:00.000 2013-10-10 00:00:00.000
Data Solutions                          2013-10-11 00:00:00.000 2099-12-31 00:00:00.000
Data Solutions-Reporting                2012-12-31 00:00:00.000 2013-10-10 00:00:00.000

某些团队被重命名（如业务系统和投资组合的情况），我希望能够为特定日期选择正确的团队。例如，如果我的报告要在2015年8月1日运行，我想看“业务系统和产品组合”，但如果报告要在2014年12月12日运行，我想看“业务系统”。我一直试图弄清楚如何做到这一点，但不能完全达到目的。有人可以帮忙吗？

Answer 1

SELECT TeamName, TeamStartDate, TeamEndDate
FROM [TableName]
WHERE '2015-08-01 00:00:00' BETWEEN TeamStartDate AND TeamEndDate

01/08/2015是您要搜索的日期

Answer 2

您的问题的答案是：无法确定;信息不足。

您可以将“业务分析”重命名为“业务系统”...或者将其重命名为“Pie”，我们所知道的。您需要一个标识符，告诉两个名称实际上属于同一个团队。

如果数据包含团队的唯一标识符，则以下示例将提供给定团队的最早名称：

DECLARE @teams TABLE(TeamID INT, TeamName varchar(100), TeamStartDate date, TeamEndDate date)

INSERT INTO @teams VALUES(1, 'Business Analysis                    ','2012-12-31 00:00:00.000','2013-06-30 00:00:00.000')
INSERT INTO @teams VALUES(2, 'Business Systems                     ','2012-06-18 00:00:00.000','2015-01-31 00:00:00.000')
INSERT INTO @teams VALUES(2, 'Business Systems and Portfolio       ','2012-12-31 00:00:00.000','2099-12-31 00:00:00.000')
INSERT INTO @teams VALUES(3,'Data Administration/eCommerce/Testing','2012-10-29 00:00:00.000','2013-10-10 00:00:00.000')
INSERT INTO @teams VALUES(4,'Data Solutions                       ','2013-10-11 00:00:00.000','2099-12-31 00:00:00.000')
INSERT INTO @teams VALUES(5, 'Data Solutions-Reporting             ','2012-12-31 00:00:00.000','2013-10-10 00:00:00.000')

SELECT *
FROM (  SELECT TeamName, TeamStartDate, TeamEndDate, ROW_NUMBER() OVER (PARTITION BY TeamID ORDER by TeamID) num
        FROM @teams
        WHERE '2014-12-12 00:00:00' BETWEEN TeamStartDate AND TeamEndDate) a
WHERE  a.num = 1

结果：

TeamName            TeamStartDate TeamEndDate num
------------------- ------------- ----------- ---
Business Systems    2012-06-18    2015-01-31  1
Data Solutions      2013-10-11    2099-12-31  1

如何从具有重叠日期的记录中选择最旧的项目

2 个答案: