SQL动态交叉表
http://blog.csdn.net/cjh47349038/archive/2008/11/12/3285082.aspx
5.2 交叉表决策分析方案 （书）
http://ajava.org/readbook/java/javafabd/9240.html
利用存储过程实现交叉表格式数据查询的一种通用方法 （建立临时表的，可学习，不实用）
http://www.cnblogs.com/pcbhyy/archive/2005/09/09/233362.html
1.
创建
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
CREATE procedure proc_across_table
@TableName as varchar(50), --生成交叉表依据的表名
@NewColumn as varchar(50), --生成表头依据的字段名
@GroupColumn as varchar(50), --分组依据的字段名
@StatColumn as varchar(50), --欲统计的字段名
@Operator as varchar(10) --统计的运算方式
AS
DECLARE @SQL as varchar(1000), @Column as varchar(50) --定义参数
EXECUTE ('DECLARE cursor_new_column CURSOR FOR SELECT DISTINCT ' + @NewColumn + ' from ' + @TableName + ' for read only ') --定义游标
begin
SET nocount ON
SET @SQL='select ' + @GroupColumn + ', ' + @Operator + '(' + @StatColumn + ') AS [' + @Operator + ' of ' + @StatColumn + ']' --定义SQL语句头
OPEN cursor_new_column
while (0=0)
BEGIN --遍历游标
FETCH NEXT FROM cursor_new_column INTO @Column --通过游标获取列头信息
if (@@fetch_status<>0) break
SET @SQL = @SQL + ', ' + @Operator + '(CASE ' + @NewColumn + ' WHEN ''' + @Column + ''' THEN ' + @StatColumn + ' ELSE 0 END) AS [' + @Column + ']' --循环追加SQL语句
END
SET @SQL = @SQL + ' from ' + @TableName + ' group by ' + @GroupColumn --定义SQL语句尾
EXECUTE(@SQL) --执行SQL语句
PRINT @SQL --输出SQL语句
IF @@error <>0 RETURN @@error --如果出错，则返回错误代码
CLOSE cursor_new_column --关闭游标
DEALLOCATE cursor_new_column RETURN 0 --释放游标，释放成功则返回0
end
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
运行
exec proc_across_table 'student1','subject','name','source','sum' 或 exec proc_across_table @TableName='student1',@NewColumn='subject',@GroupColumn='name',@StatColumn='source',@Operator='sum'
结果
2.
创建
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
CREATE procedure procedure_across_table_b
@TableName as varchar(50), --生成交叉表依据的表名
@NewColumn as varchar(50), --生成表头依据的字段名
@BeforeColumnName as varchar(50), --定义动态列开始名称
@AfterColumnName as varchar(50), --定义动态列结束名称
@GroupColumn as varchar(50), --分组依据的字段名
@FirstColumnName as varchar(50), --定义第一列名称
@StatColumn as varchar(50), --欲统计的字段名
@SecondColumnName as varchar(50), --定义第二列名称
@Operator as varchar(10) --统计的运算方式
AS
DECLARE @SQL as varchar(1000), @Column as varchar(50) --定义参数
EXECUTE ('DECLARE cursor_new_column CURSOR FOR SELECT DISTINCT ' +
@NewColumn + ' from ' + @TableName + ' for read only ') --定义游标
begin
SET nocount ON
SET @SQL='select ' + @GroupColumn + ' as '+ @FirstColumnName + ', ' + @Operator +
'(' + @StatColumn + ') AS [' + @SecondColumnName + ']' --定义SQL语句头
OPEN cursor_new_column
while (0=0)
BEGIN --遍历游标
FETCH NEXT FROM cursor_new_column INTO @Column --通过游标获取列头信息
if (@@fetch_status<>0) break
SET @SQL = @SQL + ', ' + @Operator + '(CASE ' + @NewColumn + ' WHEN ''' +
@Column + ''' THEN ' + @StatColumn + ' ELSE Null END) AS [' +
@BeforeColumnName + @Column + @AfterColumnName + ']' --循环追加SQL语句
END
SET @SQL = @SQL + ' from ' + @TableName +
' group by ' + @GroupColumn --定义SQL语句尾
EXECUTE(@SQL) --执行SQL语句
PRINT @SQL --输出SQL语句
IF @@error <>0 RETURN @@error --如果出错，则返回错误代码
CLOSE cursor_new_column --关闭游标
DEALLOCATE cursor_new_column RETURN 0 --释放游标，释放成功则返回0
end
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
运行
exec procedure_across_table_b 'student1','subject','高中','科','name','姓名','source','科目数','count'
结果
/////////////////////////////////////////////////////
表中的数据
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