在论坛中出现的比较难的sql问题：39(动态行转列 动态日期列问题)

原文:在论坛中出现的比较难的sql问题：39(动态行转列 动态日期列问题)

最近，在论坛中，遇到了不少比较难的sql问题，虽然自己都能解决，但发现过几天后，就记不起来了，也忘记解决的方法了。

所以，觉得有必要记录下来，这样以后再次碰到这类问题，也能从中获取解答的思路。

求一SQL语句。

http://bbs.csdn.net/topics/390496661

create table #tab 





(





col1 char(10),





col2 char(10),





item char(10),





num int,





[Date] varchar(10))





insert #tab values('AAA','BBB','A',50,'2013-06-10')





insert #tab values('ABB','BGG','B',30,'2013-06-10')





insert #tab values('AAA','BBB','C',80,'2013-06-13')

我的解法：

create table tab 





(





col1 char(10),





col2 char(10),





item char(10),





num int,





[Date] varchar(10)





)





 





insert tab values('AAA','BBB','A',50,'2013-06-10')





insert tab values('ABB','BGG','B',30,'2013-06-10')





insert tab values('AAA','BBB','C',80,'2013-06-13')





 





 





 





 





--动态生成sql语句





declare @start_date varchar(10) = '2013-06-01',





        @end_date   varchar(10) = '2013-06-30';





 





declare @date  varchar(10),





        @sql   varchar(max) = '',





        @sql1  varchar(8000),





        @sql2  varchar(8000);





 





set @date = @start_date;





 





set @sql1 = 'select case when rownum = 1 then col1 else '''' end as col1,





                    case when rownum = 1 then col2 else '''' end as col2,





                    item'





 





set @sql2 = 'select col1,col2,item,row_number() over(partition by col1,col2 





                                                         order by item) as rownum'





        





 





while @date <= @end_date





begin





    set @sql1 = @sql1 + ',v_' + REPLACE( right(@date,5),'-','') + 





                        ' as ''' + CAST(DATEPART(month,@date) as varchar) + '/' +





                                 CAST(DATEPART(day,@date) as varchar) +'''';                                  





	set @sql2 = @sql2 + ',SUM(case when date =''' + @date + 





	                   ''' then num else 0 end) as v_' + 





	                   REPLACE( right(@date,5),'-','')





	





	set @date = CONVERT(varchar(10),dateadd(day,1,@date),120)





end





 





 





set @sql = @sql1 + ' from (' +





                       @sql2 + ' from tab 





                                 group by col1,col2,item' +





                   ') v'





 





--生产的动态sql语句                  





select @sql





 





 





exec(@sql)

上面由于是动态生成语句，所以不能用局部的临时表，所以建了一个表。

下面是动态生成的sql语句，经过了格式化：

select case when rownum = 1 then col1 else '' end as col1,





       case when rownum = 1 then col2 else '' end as col2,                     





       item,





       





       v_0601 as '6/1',v_0602 as '6/2',v_0603 as '6/3',





       v_0604 as '6/4',v_0605 as '6/5',





       v_0606 as '6/6',v_0607 as '6/7',





       v_0608 as '6/8',v_0609 as '6/9',





       v_0610 as '6/10',v_0611 as '6/11',





       v_0612 as '6/12',v_0613 as '6/13',





       v_0614 as '6/14',v_0615 as '6/15',





       v_0616 as '6/16',v_0617 as '6/17',





       v_0618 as '6/18',v_0619 as '6/19',





       v_0620 as '6/20',v_0621 as '6/21',





       v_0622 as '6/22',v_0623 as '6/23',





       v_0624 as '6/24',v_0625 as '6/25',





       v_0626 as '6/26',v_0627 as '6/27',





       v_0628 as '6/28',v_0629 as '6/29',





       v_0630 as '6/30' 





from 





(





	select col1,col2,item,





	





		   row_number() over(partition by col1,col2  order by item) as rownum,





		   





		   SUM(case when date ='2013-06-01' then num else 0 end) as v_0601,





		   SUM(case when date ='2013-06-02' then num else 0 end) as v_0602,





		   SUM(case when date ='2013-06-03' then num else 0 end) as v_0603,





		   SUM(case when date ='2013-06-04' then num else 0 end) as v_0604,





		   SUM(case when date ='2013-06-05' then num else 0 end) as v_0605,





		   SUM(case when date ='2013-06-06' then num else 0 end) as v_0606,





		   SUM(case when date ='2013-06-07' then num else 0 end) as v_0607,





		   SUM(case when date ='2013-06-08' then num else 0 end) as v_0608,





		   SUM(case when date ='2013-06-09' then num else 0 end) as v_0609,





		   SUM(case when date ='2013-06-10' then num else 0 end) as v_0610,





		   SUM(case when date ='2013-06-11' then num else 0 end) as v_0611,





		   SUM(case when date ='2013-06-12' then num else 0 end) as v_0612,





		   SUM(case when date ='2013-06-13' then num else 0 end) as v_0613,





		   SUM(case when date ='2013-06-14' then num else 0 end) as v_0614,





		   SUM(case when date ='2013-06-15' then num else 0 end) as v_0615,





		   SUM(case when date ='2013-06-16' then num else 0 end) as v_0616,





		   SUM(case when date ='2013-06-17' then num else 0 end) as v_0617,





		   SUM(case when date ='2013-06-18' then num else 0 end) as v_0618,





		   SUM(case when date ='2013-06-19' then num else 0 end) as v_0619,





		   SUM(case when date ='2013-06-20' then num else 0 end) as v_0620,





		   SUM(case when date ='2013-06-21' then num else 0 end) as v_0621,





		   SUM(case when date ='2013-06-22' then num else 0 end) as v_0622,





		   SUM(case when date ='2013-06-23' then num else 0 end) as v_0623,





		   SUM(case when date ='2013-06-24' then num else 0 end) as v_0624,





		   SUM(case when date ='2013-06-25' then num else 0 end) as v_0625,





		   SUM(case when date ='2013-06-26' then num else 0 end) as v_0626,





		   SUM(case when date ='2013-06-27' then num else 0 end) as v_0627,





		   SUM(case when date ='2013-06-28' then num else 0 end) as v_0628,





		   SUM(case when date ='2013-06-29' then num else 0 end) as v_0629,





		   SUM(case when date ='2013-06-30' then num else 0 end) as v_0630 





	from tab                                    





	group by col1,col2,item





) v

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