SQL SERVER 号码段合并

代码：

CREATE TABLE #TMP(
    ID INT,
    S NVARCHAR(100),
    E NVARCHAR(100))
 
INSERT INTO #TMP(ID,S,E)
SELECT 1,1,2000 UNION ALL
SELECT 1,2001,4000 UNION ALL
SELECT 1,5000,6000 UNION ALL
SELECT 2,20001,30000 UNION ALL
SELECT 2,40001,50000 UNION ALL
SELECT 2,30001,40000

SELECT max(a.id) id,a.s ,min(case when (b.e IS NOT NULL) THEN b.e ELSE a.e end) FROM #tmp a 
left JOIN #tmp b ON  a.id=b.id AND a.e+1=b.s
WHERE  NOT EXISTS(SELECT 1 FROM #tmp WHERE e+1 =a.s AND id=a.id)
AND NOT EXISTS(SELECT 1 FROM #tmp WHERE s+1=b.e AND id=a.id)
GROUP BY a.id,a.s ORDER BY id

结果

<p>id          s       e                                                                                 
1           1       4000
1           5000    6000
2           20001   40000</p><p>(3 行受影响)
</p>

url:http://greatverve.cnblogs.com/archive/2011/07/22/sql-Merge.html