Dynamic Cross-Tabs/Pivot Tables 通用统计报表列转行存储过程

本文介绍了一种在SQL中创建动态交叉表和透视表的方法，通过存储过程实现行到列的转换，提供了多个示例来展示如何使用该过程进行数据聚合与分析。

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--------------------------------------行,列转换
---geovindu@163.com
---www.dusystem.com
---涂聚文
use pubs
GO

CREATE PROCEDURE crosstab
@select varchar(8000),
@sumfunc varchar(100),
@pivot varchar(100),
@table varchar(100)
AS

DECLARE @sql varchar(8000), @delim varchar(1)
SET NOCOUNT ON
SET ANSI_WARNINGS OFF

EXEC ('SELECT ' + @pivot + ' AS pivot INTO ##pivot FROM ' + @table + ' WHERE 1=2')
EXEC ('INSERT INTO ##pivot SELECT DISTINCT ' + @pivot + ' FROM ' + @table + ' WHERE '
+ @pivot + ' Is Not Null')

SELECT @sql='', @sumfunc=stuff(@sumfunc, len(@sumfunc), 1, ' END)' )

SELECT @delim=CASE Sign( CharIndex('char', data_type)+CharIndex('date', data_type) )
WHEN 0 THEN '' ELSE '''' END
FROM tempdb.information_schema.columns
WHERE table_name='##pivot' AND column_name='pivot'

SELECT @sql=@sql + '''' + convert(varchar(100), pivot) + ''' = ' +
stuff(@sumfunc,charindex( '(', @sumfunc )+1, 0, ' CASE ' + @pivot + ' WHEN '
+ @delim + convert(varchar(100), pivot) + @delim + ' THEN ' ) + ', ' FROM ##pivot

DROP TABLE ##pivot

SELECT @sql=left(@sql, len(@sql)-1)
SELECT @select=stuff(@select, charindex(' FROM ', @select)+1, 0, ', ' + @sql + ' ')

EXEC (@select)
SET ANSI_WARNINGS ON
GO
---1 应用实例
EXECUTE crosstab 'select title from titles inner join sales on (sales.title_id=titles.title_id)
group by title', 'sum(qty)','stor_id','stores'

isnull(sum(qty),0)
---2子应用实例
use pubs

EXECUTE crosstab 'select pub_name, count(qty) as orders, sum(qty) as total
from sales inner join titles on (sales.title_id=titles.title_id)
right join publishers on (publishers.pub_id=titles.pub_id)
group by pub_name', 'sum(qty)','type','titles'

select pub_name, count(qty) as orders, isnull(sum(qty),0) as total
from sales inner join titles on (sales.title_id=titles.title_id)
right join publishers on (publishers.pub_id=titles.pub_id)
group by pub_name

---3 应用实例
use Northwind
EXECUTE crosstab 'SELECT LastName FROM Employees INNER JOIN Orders
ON (Employees.EmployeeID=Orders.EmployeeID)
GROUP BY LastName', 'count(lastname)', 'Year(OrderDate)', 'Orders'

from: http://www.sqlteam.com/article/dynamic-cross-tabs-pivot-tables