sql语句之静态行转列（转）

（一) 首先我们先创建一个测试表，往里面插入测试数据，返回表记录如图2所示：

--创建测试表
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[TestRows2Columns]') AND type in (N'U'))
DROP TABLE [dbo].[TestRows2Columns]
GO
CREATE TABLE [dbo].[TestRows2Columns](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [UserName] [nvarchar](50) NULL,
    [Subject] [nvarchar](50) NULL,
    [Source] [numeric](18, 0) NULL
) ON [PRIMARY]
GO

--插入测试数据
INSERT INTO [TestRows2Columns] ([UserName],[Subject],[Source]) 
    SELECT N'张三',N'语文',60  UNION ALL
    SELECT N'李四',N'数学',70  UNION ALL
    SELECT N'王五',N'英语',80  UNION ALL
    SELECT N'王五',N'数学',75  UNION ALL
    SELECT N'王五',N'语文',57  UNION ALL
    SELECT N'李四',N'语文',80  UNION ALL
    SELECT N'张三',N'英语',100
GO

SELECT * FROM [TestRows2Columns]

 

(二) 先以静态的方式实现行转列，效果如图3所示：

--1：静态拼接行转列
SELECT [UserName],
SUM(CASE [Subject] WHEN '数学' THEN [Source] ELSE 0 END) AS '[数学]',
SUM(CASE [Subject] WHEN '英语' THEN [Source] ELSE 0 END) AS '[英语]',
SUM(CASE [Subject] WHEN '语文' THEN [Source] ELSE 0 END) AS '[语文]'     
FROM [TestRows2Columns]
GROUP BY [UserName]
GO