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博客园 - ypq

cxGrid让指定的某行自动呈选选中的状态 VMware Esxi5.5中嵌套虚拟机的网络设置方法 SQLServer (2005/2008) 日志清理方法 控制cxGrid 主从表的明细只展开一个 关于Delphi cxGrid主从表中从表只能编辑第一条记录的问题 行字段值拼接成字符串 关于cxGrid选中行操作关联数据集的一种方法 安全释放 TreeView的DATA! delphi中遍历枚举类型的方法 oracle临时表的两种方式 关于PLSQL的存储过程参数 创建variant二维数组 kav 优化设置(转) - ypq - 博客园 [转载]oracle备份与恢复精华资料 ASP.NET学习线路(转) MS-SQLSERVER--错用了LEN()函数 反向解析(PTR)(转): 域名”A记录,MX记录,CNAME记录,TTL值,URL转发”解释 开博了!
数据库表行转列,列转行终极方案(转)
ypq · 2008-05-26 · via 博客园 - ypq

--行转列问题
--建立測試環境
Create Table TEST
(DATES Varchar(6),
 EMPNO Varchar(5),
 STYPE Varchar(1),
 AMOUNT Int)
--插入數據
Insert TEST Select '200605',  '02436',     'A',        5
Union All Select '200605',  '02436',     'B',        3
Union All Select '200605',  '02436',     'C',        3
Union All Select '200605',  '02436',     'D',        2
Union All Select '200605',  '02436',     'E',        9
Union All Select '200605',  '02436',     'F',        7
Union All Select '200605',  '02436',     'G',        6
Union All Select '200605',  '02438',     'A',        7
Union All Select '200605',  '02438',     'B',        8
Union All Select '200605',  '02438',     'C',        0
Union All Select '200605',  '02438',     'D',        3
Union All Select '200605',  '02438',     'E',        4
Union All Select '200605',  '02438',     'F',        5
Union All Select '200605',  '02438',     'G',        1
GO
--測試
--如果STYPE固定,可以這麼寫
Select
DATES,
EMPNO,
SUM(Case STYPE When 'A' Then AMOUNT Else 0 End) As A,
SUM(Case STYPE When 'B' Then AMOUNT Else 0 End) As B,
SUM(Case STYPE When 'C' Then AMOUNT Else 0 End) As C,
SUM(Case STYPE When 'D' Then AMOUNT Else 0 End) As D,
SUM(Case STYPE When 'E' Then AMOUNT Else 0 End) As E,
SUM(Case STYPE When 'F' Then AMOUNT Else 0 End) As F,
SUM(Case STYPE When 'G' Then AMOUNT Else 0 End) As G
From TEST
Group By DATES,EMPNO
Order By DATES,EMPNO

--如果STYPE不固定,用動態語句
Declare @S Varchar(1000)
Set @S=''
Select @S=@S+',SUM(Case STYPE When '''+STYPE+''' Then AMOUNT Else 0 End) As '+STYPE From (Select Distinct STYPE From TEST) A Order By STYPE
Set @S='Select DATES,EMPNO'+@S+' From TEST Group By DATES,EMPNO Order By DATES,EMPNO'
EXEC(@S)
GO
--如果被转置的是数字类型的话,应用下列语句
DECLARE @S VARCHAR(1000)
SET @S='SELECT DATES,EMPNO '
SELECT @S=@S+',['+STYPE+']=SUM(CASE WHEN STYPE='''+STYPE+''' THEN AMOUNT ELSE 0 END)'
FROM (Select Distinct STYPE From TEST) A Order By STYPE
SET @S=@S+' FROM TEST GROUP BY DATES,EMPNO'
EXEC(@S) 

如果是列转行的话直接Union All就可以了

例如 :

city style      color 46 48 50 52
长沙 S6MF01002   152  1  2  2 1
长沙 S6MF01002   201  1  2  2 1
上面到下面的样子
city   style          color size qty
长沙 S6MF01002       152    46  1
长沙 S6MF01002       152    48   2
长沙 S6MF01002       152    50   2
长沙 S6MF01002       152    52  1
长沙 S6MF01002       201    46  1
长沙 S6MF01002       201    48  2
长沙 S6MF01002       201    50  2
长沙 S6MF01002       201    52  1

Select City,Style,Color,[46] From Test
Union all
Select City,Style,Color,[48] From Test
Union all
Select City,Style,Color,[50] From Test
Union all
Select City,Style,Color,[52] From Test