如何获得TSQL中第一列的输入结束？

Question

我有这个表是这样的：

Sequence 
2089697 
2089738 
2089838 
2090368 
2090400 

我想有另一列

Sequence; EndSequence 
2089697; 2089737 
2089738; 2089837 
2089838; 2090367 
2090368; 2090399 
2090400; null 

的EndSequence将是顺序列的下一个记录的结束。

Answer 1

您可以将表加入自己，其中连接中的条件是匹配右侧的记录大于左侧记录的值。然后通过在左侧和聚集在右边最小值的数值组：

SELECT l.Sequence, MIN(r.Seqence)-1 "EndSequence" 
FROM table l 
LEFT JOIN table r ON r.Sequence > l.Sequence 
GROUP BY l.Sequence 

Answer 2

对于SQL Server 2005/2008

WITH records 
AS 
(
    SELECT Sequence, 
      ROW_NUMBER() OVER (ORDER BY Sequence ASC) rn 
    FROM TableName 
) 
SELECT a.Sequence, b.Sequence - 1 EndSequence 
FROM records a 
     LEFT JOIN records b 
      ON a.rn+1 = b.rn 

• SQLFiddle Demo

对于SQL SERVER 2012

SELECT SEQUENCE, 
     LEAD(SEQUENCE) OVER (ORDER BY SEQUENCE) - 1 EndSequence 
FROM TableName 

• SQLFiddle Demo