求注释
求高手注释下面句子,比较长,分数也会全给!因刚进,分数不多,望各牛人帮忙
还有中间的if 想用循环换掉,可尝试失败
USE [Financial-ODS-bk]
GO

/****** Object: StoredProcedure [dbo].[CrossTab] Script Date: 09/19/2012 16:29:33 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

-- CREATE procedure [dbo].[CrossTab] 
CREATE procedure [dbo].[CrossTab] 
(
@select varchar(2000),
@PivotCol varchar(100), 
@Summaries varchar(100), 
@GroupBy varchar(100),
@OtherCols varchar(100),
@OrderByCols varchar(100)
)

-- @OrderByCols varchar(100) = Null
AS
set nocount on
set ansi_warnings off 
declare @sql varchar(1000)

Select @sql = ''

Select @OtherCols= isNull(', ' + @OtherCols,'')

create table #pivot_columns (pivot_column_name varchar(100))

Select @sql='select ''' + replace( + @PivotCol,',',''' as pivot_column_name union all select ''')+''''

insert into #pivot_columns
exec(@sql)

select @sql=''

create table #pivot_columns_data (pivot_column_name varchar(100),pivot_column_data varchar(100))

Select @PivotCol=''

Select @PivotCol=min(pivot_column_name) from #pivot_columns

While @PivotCol>''
Begin
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) 
  exec 
  (
  'select distinct ''' + @PivotCol +''' as pivot_column_name, convert(varchar(100),' + @PivotCol + ') as pivot_column_data from 
  ('+
  @select
  +'
  ) T'
  )
   
  

  Select @PivotCol=min(pivot_column_name) from #pivot_columns where pivot_column_name>@PivotCol
end 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120101') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120101')

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120201') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120201') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120301') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120301') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120401') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120401') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120501') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120501') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120601') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120601') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120701') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120701') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120801') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120801') 

if (select count(1) from #pivot_columns_data where pivot_column_data = '20120901') = 0 
  insert into #pivot_columns_data(pivot_column_name,pivot_column_data) values ('fromDateString', '20120901') 

if (s