硬TSQL的問題 - 行值多少按順序

Question

可以說，我有

date,personid 
1/1/2001 1 
1/2/2001 3 
1/3/2001 2 
1/4/2001 2 
1/5/2001 5 
1/6/2001 5 
1/7/2001 6 

一個表，我要請更新2001年1月2日或2001年1月5日與personid 2，但在我可以更新之前，我必須確保它通過一條規則，說你連續三天都不能有人。 我如何解決這個問題在一個mssql存儲過程？

更新：它也需要解決這一佈局，以及在那裏我會更新2001年1月5日

date,personid 
1/1/2001 1 
1/2/2001 3 
1/3/2001 2 
1/4/2001 2 
1/5/2001 1 
1/6/2001 2 
1/7/2001 2 
1/8/2001 5 
1/9/2001 5 
1/10/2001 6 

Answer 1

我認爲date是唯一讓我知道這是不是案子！

DECLARE @basedata TABLE ([date] UNIQUE DATE,personid INT) 
INSERT INTO @basedata 
SELECT GETDATE()+1, 2 union all 
SELECT GETDATE()+2, 3 union all 
SELECT GETDATE()+3, 2 union all 
SELECT GETDATE()+4, 2 union all 
SELECT GETDATE()+5, 5 union all 
SELECT GETDATE()+6, 5 union all 
SELECT GETDATE()+7, 6 


DECLARE @date date = GETDATE()+5 
DECLARE @personid int = 2 


;WITH T AS 
(
SELECT TOP 2 [date],personid 
FROM @basedata 
WHERE [date] < @date 
ORDER BY [date] DESC 
UNION ALL 
SELECT @date, @personid 
UNION ALL 
SELECT TOP 2 [date],personid 
FROM @basedata 
WHERE [date] > @date 
ORDER BY [date] 
),T2 AS 
(
SELECT *, 
     ROW_NUMBER() OVER (ORDER BY [date]) - 
     ROW_NUMBER() OVER (PARTITION BY personid ORDER BY [date]) AS Grp 
FROM T 
) 
SELECT COUNT(*) /*Will return a result if that date/personid 
        would cause a sequence of 3*/ 
FROM T2 
GROUP BY personid,Grp 
HAVING COUNT(*) >=3 

Answer 2

SET @TargetDate = '1/2/2001' 

SELECT @ForwardCount = COUNT(*) FROM table WHERE ([date] BETWEEN @TargetDate AND DATEADD(dd, 2, @TargetDate)) WHERE PersonID = @PersonID 

SELECT @BackwardCount = COUNT(*) FROM table WHERE ([date] BETWEEN @TargetDate AND DATEADD(dd, -2, @TargetDate)) WHERE PersonID = @PersonID 

SELECT @BracketCount = COUNT(*) FROM table WHERE ([date] BETWEEN DATEADD(dd, -1, @TargetDate) AND DATEADD(dd, 1, @TargetDate)) WHERE PersonID = @PersonID 

IF (@ForwardCount < 2) AND (@BackwardCount < 2) AND (@BracketCount < 2) 
BEGIN 
-- Do your update here 
END 

Answer 3

還有第三種情況沒有列出，它是日期間的情況。我將它包含在下面的解決方案中。

輸出是

PersonId TrackDate UnallowedBefore UnallowedAfter 
----------- ---------- --------------- -------------- 
2   01/04/2001 01/02/2001  01/05/2001 
5   01/06/2001 01/04/2001  01/07/2001 
6   01/08/2001 01/08/2001  01/08/2001 

USE tempdb 
GO 
IF OBJECT_ID('PersonDates') IS NOT NULL DROP TABLE PersonDates 
CREATE TABLE PersonDates 
(
    PersonId int  NOT NULL, 
    TrackDate datetime NOT NULL 
) 

INSERT INTO PersonDates 
(
    TrackDate, 
    PersonId 
) 
SELECT '1/1/2001', 1 
UNION ALL 
SELECT '1/2/2001', 3 
UNION ALL 
SELECT '1/3/2001', 2 
UNION ALL 
SELECT '1/4/2001', 2 
UNION ALL 
SELECT '1/5/2001', 5 
UNION ALL 
SELECT '1/6/2001', 5 
UNION ALL 
SELECT '1/7/2001', 6 
UNION ALL 
SELECT '1/8/2001', 2 
UNION ALL 
SELECT '1/9/2001', 6 

SELECT 
    P.PersonId, 
    TrackDate = CONVERT(varchar(10), DATEADD(day, 1, P.TrackDate), 101), 
    T.UnallowedBefore, 
    T.UnallowedAfter 
FROM 
    PersonDates P 

    CROSS APPLY 
    (
    SELECT TOP 1 
     UnallowedAfter = CASE 
     WHEN DATEDIFF(day, P.TrackDate, TrackDate) = 1 
     THEN CONVERT(varchar(10), DATEADD(day, 1, TrackDate), 101) 
     ELSE CONVERT(varchar(10), DATEADD(day, -1, TrackDate), 101) 
     END, 
     UnallowedBefore = CASE 
     WHEN DATEDIFF(day, P.TrackDate, TrackDate) = 1 
     THEN CONVERT(varchar(10), DATEADD(day, -2, TrackDate), 101) 
     ELSE CONVERT(varchar(10), DATEADD(day, -1, TrackDate), 101) 
     END 
    FROM 
     PersonDates 
    WHERE 
     PersonId = P.PersonId 
     AND 
     DATEDIFF(day, P.TrackDate, TrackDate) IN (1,2) 
) T 

Answer 4

這裏是我的parametrised解決方案：

WITH nearby AS (
    SELECT 
    date, 
    personid = CASE date WHEN @date THEN @personid ELSE personid END 
    FROM atable 
    WHERE date BETWEEN DATEADD(day, -@MaxInARow, @date) 
       AND DATEADD(day, @MaxInARow, @date) 
), 
nearbyGroups AS (
    SELECT 
    *, 
    Grp = DATEDIFF(day, 0, date) - 
      ROW_NUMBER() OVER (PARTITION BY personid ORDER BY date) 
    FROM nearby 
) 
UPDATE atable 
SET personid = @personid 
WHERE date = @date 
    AND NOT EXISTS (
    SELECT Grp 
    FROM nearbyGroups 
    GROUP BY Grp 
    HAVING COUNT(*) > @MaxInARow 
) 

@date代表其personid欄應更新的日期。 @personid是要存儲的新值。 @MaxInARow是允許存儲相同personid的行中的最大天數。