分组合并，动态分列

 1 IF OBJECT_ID(‘TEMPDB..#TEMP‘)>0
 2 DROP TABLE #TEMP
 3 GO
 4 IF OBJECT_ID(‘TEMPDB..#TEMP2‘)>0
 5 DROP TABLE #TEMP2
 6 GO
 7 
 8 --模拟数据
 9 SELECT *INTO #TEMP FROM (
10 SELECT ‘A‘ col1,‘B‘ col2,‘C‘ col3,‘1‘ X,‘2‘Y,‘3‘Z
11 UNION ALL
12 SELECT ‘A‘ A,‘B‘ B,‘C‘ C,‘4‘ X,‘5‘Y,‘6‘Z
13 UNION ALL
14 SELECT ‘A‘ A,‘B‘ B,‘C‘ C,‘7‘ X,‘8‘Y,‘9‘Z
15 UNION ALL
16 SELECT ‘D‘ A,‘E‘ B,‘F‘ C,‘1‘ X,‘2‘Y,‘3‘Z
17 UNION ALL
18 SELECT ‘D‘ A,‘E‘ B,‘F‘ C,‘4‘ X,‘5‘Y,‘6‘Z
19 UNION ALL
20 SELECT ‘D‘ A,‘E‘ B,‘F‘ C,‘7‘ X,‘8‘Y,‘9‘Z
21 UNION ALL
22 SELECT ‘G‘ A,‘H‘ B,‘I‘ C,‘1‘ X,‘2‘Y,‘3‘Z
23 UNION ALL
24 SELECT ‘G‘ A,‘H‘ B,‘I‘ C,‘4‘ X,‘5‘Y,‘6‘Z
25 UNION ALL
26 SELECT ‘G‘ A,‘H‘ B,‘I‘ C,‘7‘ X,‘8‘Y,‘9‘Z)USB
27 SELECT *FROM #TEMP
28 --分组合并
29 SELECT USB.col1,USB.col2,USB.col3
30 ,LEFT(xxx,LEN(XXX)-1)‘XXX‘
31 INTO #TEMP2
32 FROM (
33 SELECT col1,col2,col3
34 ,(SELECT X+‘,‘+Y+‘,‘+Z+‘,‘ FROM #TEMP T1 
35 WHERE T1.col1=T2.col1
36 AND t1.col2=t2.col2
37 AND t1.col3=t2.col3
38 FOR XML PATH(‘‘))AS ‘xxx‘
39 FROM #TEMP T2
40 GROUP BY T2.col1,T2.col2,T2.col3)USB
41 SELECT * FROM #TEMP2
42 --分列处理
43 DECLARE @SQL NVARCHAR(2000),@I INT
44 SET @I=1
45 WHILE EXISTS(SELECT 1 FROM #TEMP2 WHERE XXX<>‘‘)
46 BEGIN
47 SET @SQL=‘ALTER TABLE #TEMP2 ADD 字段‘+CONVERT(VARCHAR,@I)+‘ VARCHAR(20)‘
48 EXEC(@SQL)
49 SET @SQL=‘declare @loc int update #temp2 set @loc=charindex(‘‘,‘‘,xxx),字段‘
50     +convert(varchar,@i)+‘=convert(int,case @loc when 0 then xxx else ‘
51     +‘substring(xxx,1,@loc-1) end),xxx=case @loc when 0 then ‘‘‘‘ else ‘
52     +‘substring(xxx,@loc+1,len(xxx)-@loc) end  where xxx<>‘‘‘‘‘
53     EXEC(@SQL)
54     SET @I=@I+1
55 END
56 ALTER TABLE #TEMP2 DROP COLUMN XXX
57 --结果
58 SELECT *FROM #TEMP2