Merging périodes d'absence

Question

Je l'ensemble de données suivantes:

;with Data AS 
(
select '001' AS PERSONNUM,'2017-09-18 00:00:00.000' AS START,'2017-09-21 00:00:00.000' AS [END] 
UNION 
select '001','2017-09-22 00:00:00.000' AS START,'2017-09-22 00:00:00.000' AS [END] 
UNION 
select '002','2017-09-18 00:00:00.000' AS START,'2017-09-20 00:00:00.000' AS [END] 
UNION 
select '002','2017-09-22 00:00:00.000' AS START,'2017-09-22 00:00:00.000' AS [END] 
) 
select * from Data 

je dois fusionner les dossiers si la différence de jours entre la colonne START de la ligne suivante et la colonne END de la colonne précédente pour certains employés (PERSONNUM) est égal à 1. Dans mes exemples, pour les enregistrements «001» de personne, il faut fusionner, pour la personne «002», pas de changement.

Ainsi, les résultats attendus seront les suivants:

Merci à l'avance!

Answer 1

Quelque chose le long de ces lignes ... Fondamentalement prises directement à partir Itzik Ben-Gan's New Solution to the Packing Intervals Problem

IF OBJECT_ID('tempdb..#TestData', 'U') IS NOT NULL 
DROP TABLE #TestData; 

CREATE TABLE #TestData (
    PersonId CHAR(3), 
    BegDT DATETIME, 
    EndDT DATETIME 
    ); 
INSERT #TestData(PersonId, BegDT, EndDT) VALUES 
    (1, '20151231 08:00:00', '20151231 08:30:00'), 
    (1, '20151231 08:30:00', '20151231 09:00:00'), 
    (1, '20151231 09:00:00', '20151231 09:30:00'), 
    (1, '20151231 10:00:00', '20151231 11:00:00'), 
    (1, '20151231 10:30:00', '20151231 12:00:00'), 
    (1, '20151231 11:30:00', '20151231 12:30:00'), 
    (2, '20151231 08:00:00', '20151231 10:30:00'), 
    (2, '20151231 08:30:00', '20151231 10:00:00'), 
    (2, '20151231 09:00:00', '20151231 09:30:00'), 
    (2, '20151231 11:00:00', '20151231 11:30:00'), 
    (2, '20151231 11:32:00', '20151231 12:00:00'), 
    (2, '20151231 12:04:00', '20151231 12:30:00'), 
    (3, '20151231 08:00:00', '20151231 09:00:00'), 
    (3, '20151231 08:00:00', '20151231 08:30:00'), 
    (3, '20151231 08:30:00', '20151231 09:00:00'), 
    (3, '20151231 09:30:00', '20151231 09:30:00'); 

WITH 
    cte_MPE AS (
     SELECT 
      td.PersonId, td.BegDT, td.EndDT, 
      MaxPrevEnd = MAX(td.EndDT) OVER (PARTITION BY td.PersonId ORDER BY td.BegDT, td.EndDT ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) 
     FROM 
      #TestData td 
     ), 
    cte_DivGroup AS (
     SELECT 
      m.PersonId, m.BegDT, m.EndDT, m.MaxPrevEnd, 
      DivGroup = SUM(x.NewBeg) OVER (PARTITION BY m.PersonId ORDER BY m.BegDT, m.EndDT ROWS UNBOUNDED PRECEDING) 
     FROM 
      cte_MPE m 
      CROSS APPLY (VALUES (IIF(m.BegDT <= m.MaxPrevEnd, NULL, 1))) x (NewBeg) 
     ) 
SELECT 
    dg.PersonId, 
    BegDT = MIN(dg.BegDT), 
    EndDT = MAX(dg.EndDT) 
FROM 
    cte_DivGroup dg 
GROUP BY 
    dg.PersonId, 
    dg.DivGroup 
ORDER BY 
    dg.PersonId; 

... Résultats

PersonId BegDT     EndDT 
-------- ----------------------- ----------------------- 
1  2015-12-31 08:00:00.000 2015-12-31 09:30:00.000 
1  2015-12-31 10:00:00.000 2015-12-31 12:30:00.000 
2  2015-12-31 08:00:00.000 2015-12-31 10:30:00.000 
2  2015-12-31 11:00:00.000 2015-12-31 11:30:00.000 
2  2015-12-31 11:32:00.000 2015-12-31 12:00:00.000 
2  2015-12-31 12:04:00.000 2015-12-31 12:30:00.000 
3  2015-12-31 08:00:00.000 2015-12-31 09:00:00.000 
3  2015-12-31 09:30:00.000 2015-12-31 09:30:00.000