1 --创建测试表
2 CREATE TABLE [dbo].[TestRows2Columns](
3 [Id] [int] IDENTITY(1,1) NOT NULL,
4 [UserName] [nvarchar](50) NULL,
5 [Subject] [nvarchar](50) NULL,
6 [Source] [numeric](18,0) NULL
7 )
8 GO
9
10 --插入测试数据
11 INSERT INTO [TestRows2Columns] ([UserName],[Subject],[Source])
12 SELECT N'张三',N'语文',60 UNION ALL
13 SELECT N'李四',N'数学',70 UNION ALL
14 SELECT N'王五',N'英语',80 UNION ALL
15 SELECT N'王五',N'数学',75 UNION ALL
16 SELECT N'王五',N'语文',57 UNION ALL
17 SELECT N'李四',N'语文',80 UNION ALL
18 SELECT N'张三',N'英语',100
19 GO
20
21 SELECT * FROM [TestRows2Columns]
22
23
24
25
26 --1 通过 select 累加
27 DECLARE @sql_col VARCHAR(8000)
28 SELECT @sql_col = ISNULL(@sql_col + ',','') + QUOTENAME([Subject]) FROM TestRows2Columns
29 GROUP BY [Subject]
30
31 SELECT @sql_col
32
33
34
35
36 --2 通过 FOR xml path('') 合并字符串记录
37 SELECT
38 STUFF(
39 (SELECT '#' + Subject
40 FROM TestRows2Columns
41 WHERE UserName = '王五'
42 FOR xml path('')
43 ),1,1,''
44 )
45
46
47 --3 分组合并字符串记录
48 SELECT
49 UserName,
50 Subject = (
51 STUFF(
52 (SELECT '#' + Subject
53 FROM TestRows2Columns
54 WHERE UserName = A.UserName
55 FOR xml path('')
56 ),1,1,''
57 )
58 )
59 FROM TestRows2Columns A
60 GROUP by UserName
