检查第一行日期是否在下一行日期之间

Question

每行有一个 DateEff 和一个 DateExp。假设我 return 5 行。我需要检查第一行的 DateEff 以查看它是否位于第二、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。

这是数据的示例。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。

Table

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

结果应该是这样的

 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 table 与自身连接到 return 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

我认为这对你有用：

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;

根据您的示例数据，结果如下：

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

要从您的示例中获得准确的输出（不包括第 4 行），请将应用中的条件更改为 t.DateEff > dateeff and t.DateEff < DateExp and rowid > t.rowid。输出将是：

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

检查第一行日期是否在下一行日期之间

check the first rows date is in between the next rows date

sql-server

date

sql-server-2014