Question

每行都有DateEff和DateExp。让我说我返回5行。我需要检查第一行中的DateEff，看它是否位于第二，第三，第四和第五行的DateEff和DateExp之间，依此类推。我需要检查每个DateEff，以确保它不在任何行DateEff和DateExp之间。

以下是数据外观的示例。如您所见，第3行DateEff是（2013-03-30），它位于第4行DateEff和DateExp以及第5行DateEff和“DateExp”之间。

表

rowid  DateEff         DateExp
  1    1969-01-01      2012-09-30
  2    2012-10-01      2012-12-31 
  3    2013-03-30      2014-12-31 
  4    2013-01-01      2015-02-10 
  5    2013-01-01      2999-01-01

结果看起来像这样

 Prob Id    Problem Date    Affected Id   Aff Date Range
  3         2013-03-30         4          2013-01-01 - 2015-02-10
  3         2013-03-30         5          2013-01-01 - 2999-01-01

Answer 1

将表连接到自身以返回重叠的行对：

Select a.RowID, a.DateEff as ProblemDate
, b.RowID as OverlapID, b.DateEff as OverlapStart, b.DateExp as OverlapEnd
from MyTable a
left join MyTable b
on a.RowID <> b.RowID
and a.DateEff <= b.DateExp
and a.DateEff >= b.DateEff

Answer 2

我认为这应该适合你：

string

使用您的样本数据，结果如下：

select 
    [Prob Id]        = t.rowid, 
    [Problem Date]   = t.DateEff,
    [Affected Id]    = a.rowid, 
    [Aff Date Range] = concat(a.DateEff,' - ',a.DateExp)
from tbl t -- your table is called tbl
outer apply 
(
    select * 
    from tbl -- your table is called tbl
    where t.DateEff between dateeff and DateExp and rowid > t.rowid
) a
where a.DateEff is not null
order by t.rowid, t.DateEff;

要从示例中获取确切输出（第4行除外），请将应用中的条件更改为Prob Id Problem Date Affected Id Aff Date Range 3 2013-03-30 4 2013-01-01 - 2015-02-10 3 2013-03-30 5 2013-01-01 - 2999-01-01 4 2013-01-01 5 2013-01-01 - 2999-01-01。输出将是：

t.DateEff > dateeff and t.DateEff < DateExp and rowid > t.rowid

检查第一行日期是否在下一行日期之间

2 个答案: