SQL Server：PIVOTingstring数据的示例
试图find一些简单的SQL Server PIVOT示例。 我发现的大部分例子都涉及计算或总结数字。 我只是想旋转一些string数据。 例如，我有一个查询返回以下内容。
Action1 VIEW Action1 EDIT Action2 VIEW Action3 VIEW Action3 EDIT 我想用PIVOT（如果可能的话）做出如下结果：
Action1 VIEW EDIT Action2 VIEW NULL Action3 VIEW EDIT
这甚至可能与PIVOTfunction？
请记住，MAX聚合函数将在文本和数字上起作用。 这个查询只需要扫描一次表格。
SELECT Action, MAX( CASE data WHEN 'View' THEN data ELSE '' END ) ViewCol, MAX( CASE data WHEN 'Edit' THEN data ELSE '' END ) EditCol FROM t GROUP BY Action
如果您特别想使用SQL Server PIVOT函数，那么这应该工作，假设您的两个原始列被称为act和cmd。 （虽然看起来不太好看。）
SELECT act AS 'Action', [View] as 'View', [Edit] as 'Edit' FROM ( SELECT act, cmd FROM data ) AS src PIVOT ( MAX(cmd) FOR cmd IN ([View], [Edit]) ) AS pvt
表格设置：
CREATE TABLE dbo.tbl ( action VARCHAR(20) NOT NULL, view_edit VARCHAR(20) NOT NULL ); INSERT INTO dbo.tbl (action, view_edit) VALUES ('Action1', 'VIEW'), ('Action1', 'EDIT'), ('Action2', 'VIEW'), ('Action3', 'VIEW'), ('Action3', 'EDIT');
你的表： SELECT action, view_edit FROM dbo.tbl
不使用PIVOT的查询：
SELECT Action, [View] = (Select view_edit FROM tbl WHERE t.action = action and view_edit = 'VIEW'), [Edit] = (Select view_edit FROM tbl WHERE t.action = action and view_edit = 'EDIT') FROM tbl t GROUP BY Action
使用PIVOT查询：
SELECT [Action], [View], [Edit] FROM (SELECT [Action], view_edit FROM tbl) AS t1 PIVOT (MAX(view_edit) FOR view_edit IN ([View], [Edit]) ) AS t2
两个查询结果： 
那么，对于你的样品和任何有限数量的独特列，这应该做到这一点。
select distinct a, (select distinct t2.b from t t2 where t1.a=t2.a and t2.b='VIEW'), (select distinct t2.b from t t2 where t1.a=t2.a and t2.b='EDIT') from t t1
从http://blog.sqlauthority.com/2008/06/07/sql-server-pivot-and-unpivot-table-examples/ ：
SELECT CUST, PRODUCT, QTY FROM Product) up PIVOT ( SUM(QTY) FOR PRODUCT IN (VEG, SODA, MILK, BEER, CHIPS)) AS pvt) p UNPIVOT (QTY FOR PRODUCT IN (VEG, SODA, MILK, BEER, CHIPS) ) AS Unpvt GO
With pivot_data as ( select action, -- grouping column view_edit -- spreading column from tbl ) select action, [view], [edit] from pivot_data pivot ( max(view_edit) for view_edit in ([view], [edit]) ) as p;
