Sql server 避免自连接和更新

我有一个这样的数据集

rowno   kc      id      BStart      bFinish     Perioddate  
310     48      307861  2015-01-20  2015-01-22  2015-10-10
310     48      307861  2015-01-20  2015-01-22  2016-01-16
310     48      307861  2015-01-20  2015-01-22  2016-04-23
310     48      307861  2015-01-20  2015-01-22  2016-07-30
310     48      307861  2015-01-20  2015-01-22  2016-11-05
310     48      307861  2015-01-20  2015-01-22  2019-01-13
310     48      307861  2015-01-20  2015-01-22  NULL


UPDATE m2        
  SET         
  BStart = (CASE WHEN m.BStart <= m2.BFinish and m2.BFinish <= m.Perioddate         
        THEN DATEADD(dd, 1,m.periodDate)         
    WHEN m.BStart <= m2.BFinish And m2.BFinish > m2.periodDate And m.BStart <= m.PeriodDate         
        THEN DATEADD(dd, 1,m.periodDate)        
  ELSE m.BStart END)    
  FROM #result56 AS m         
  INNER JOIN #result56 AS m2        
  ON m.ROWNO = m2.ROWNO - 1 
  and m.Kc = m2.Kc;

rowno   kc      id      BStart      bFinish     Perioddate 
310     48      307861  2015-01-20  2015-01-22  2015-10-10
310     48      307861  2015-10-11  2015-01-22  2016-01-16
310     48      307861  2016-01-17  2015-01-22  2016-04-23
310     48      307861  2016-04-24  2015-01-22  2016-07-30
310     48      307861  2016-07-31  2015-01-22  2016-11-05
310     48      307861  2016-11-06  2015-01-22  2019-01-13
310     48      307861  2019-01-14  2015-01-22  NULL

如果您只需要“前面的行”（

m.ROWNO=m2.ROWNO-1

），我建议使用；

---

但是，由于您还需要

m.Kc=m2.Kc

老实说，如果没有自连接，我看不出您希望如何实现这一点。

您在这里并不陌生，这应该是一个注释