sql - 日期中的 SQL 间隔

Question

我试图根据表格看起来像这样的状态代码来查找表格中的空白。

状态表：

StateID (PK) | Code
--------------------
1            | AK
2            | AL
3            | AR

状态模型表：

StateModelID | StateID | EfftiveDate            | ExpirationDate
-------------------------------------------------------------------------
1            |  1      | 2012-06-28 00:00:00.000| 2012-08-02 23:59:59.000
2            |  1      | 2012-08-03 00:00:00.000| 2050-12-31 23:59:59.000
3            |  1      | 2055-01-01 00:00:00.000| 2075-12-31 23:59:59.000

我正在使用的查询如下：

Declare @gapMessage varchar(250)
SET @gapMessage = ''

select
@gapMessage = @gapMessage + 
  (Select StateTable.Code FROM StateTable where t1.StateID = StateTable.StateID) 
  + ' Row ' +CAST(t1.StateModelID as varchar(6))+' has a gap with '+
  CAST(t2.StateModelID as varchar(6))+ CHAR(10)
   from StateModel t1
   inner join StateModel t2
    on
       t1.StateID = t2.StateID
       and DATEADD(ss, 1,t1.ExpirationDate) < t2.EffectiveDate
       and t1.EffectiveDate < t2.EffectiveDate

 if(@gapMessage != '')
 begin         
Print 'States with a gap problem'
PRINT @gapMessage
 end
 else
 begin
PRINT 'No States with a gap problem'
 end

但是通过上表示例，我得到以下输出：

States with a gap problem
AK Row 1 has a gap with 3
AK Row 2 has a gap with 3

无论如何要重组我的查询，以便不显示 1 和 3 之间的差距，因为 1 和 2 之间没有差距？我正在使用 MS sql server 2008 谢谢

score 3 · Accepted Answer

WITH
  sequenced AS
(
  SELECT
    ROW_NUMBER() OVER (PARTITION BY StateID ORDER BY EfftiveDate) AS SequenceID,
    *
  FROM
    StateModel
)
SELECT
  *
FROM
  sequenced    AS a
INNER JOIN
  sequenced    AS b
    ON  a.StateID    = b.StateID
    AND a.SequenceID = b.SequenceID - 1
WHERE
  a.ExpirationDate < DATEADD(second, -1, b.EfftiveDate)

为了使其尽可能有效，还要添加一个索引(StateID, EfftiveDate)

score 1 · Accepted Answer

我只想把功劳归功于 MatBailie，但还没有积分，所以我想我会帮助任何其他寻找类似解决方案的人，这些解决方案可能希望像我需要的那样更进一步。我已将他的代码（涉及会员注册）的应用程序更改为与此处示例相同的语言。

就我而言，我需要这些东西：

我有两张相似的表格，我需要将它们发展成一张总表格。在本例中，让我们制作这样的表格：SomeStates + OtherStates = UpdatedTable。这些在 AS 子句中是 UNIONED。
由于间隙，我不想删除任何行，但我想在 StateID 级别上标记它们。这是作为附加列“StateID_GapFlag”添加的。

我还想添加一列来保存最旧的或 MIN(EffectiveDate)。这将在以后的 SUM(period) 计算中使用，以获得总持续时间，不包括间隙。这是“MIN_EffectiveDate”列。

;WITH sequenced     
( SequenceID
,EffectiveDate
,ExpirationDate)
AS
    (select 
    ROW_NUMBER() OVER (PARTITION BY StateID ORDER by EffectiveDate) as SequenceID,
    * from  (select EffectiveDate, ExpirationDate from SomeStates
                UNION ALL
            (select EffectiveDate, ExpirationDate from OtherStates)
            ) StateModel
    where 
        EffectiveDate > 'filter'
    )
Select DISTINCT 
        IJ1.[MIN_EffectiveDate]
        ,coalesce(IJ2.GapFlag,'') as [MemberEnrollmentGapFlag]
        ,EffectiveDate
        ,ExpirationDate
into UpdatedTable 
from sequenced seq
        inner join 
            (select StateID, min(EffectiveDate) as 'MIN_EffectiveDate'
                from sequenced 
                group by StateID
            ) IJ1
        on seq.member# = IJ1.member
        left join
            (select a.member#, 'GAP' as 'StateID_GapFlag'
                from sequenced a
                inner join 
                    sequenced b
                        on a.StateID = b.StateID
                        and a.SequenceID = (b.sequenceID - 1)
                    where a.ExpirationDate < DATEADD(day, -1, b.EffectiveDate)
            ) LJ2
        on seq.StateID = LJ2.StateID

score 0 · Accepted Answer

您可以使用ROW_NUMBER为每个状态提供 stateModel 的排序，然后检查连续行的第二个差异是否不超过 1。类似于：

;WITH Models (StateModelID, StateID, Effective, Expiration, RowOrder) AS (
    SELECT StateModelID, StateID, EffectiveDate, ExpirationDate,
           ROW_NUMBER() OVER (PARTITION BY StateID, ORDER BY EffectiveDate)
    FROM StateModel
)
SELECT F.StateModelId, S.StateModelId
FROM Models F
CROSS APPLY (
    SELECT M.StateModelId
    FROM Models M
    WHERE M.RowOrder = F.RowOrder + 1
      AND M.StateId = F.StateId
      AND DATEDIFF(SECOND, F.Expiration, M.Effective) > 1
) S

这将为您提供有间隙的行的状态模型 ID，您可以按照自己的意愿对其进行格式化。

sql - 日期中的 SQL 间隔

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