SQL Server:5列以上的动态数据透视 [英] SQL Server : dynamic pivot over 5 columns
问题描述
我很难解决如何在多列SQL Server 2008中进行动态透视的问题.
I'm having a very tough time trying to figure out how to do a dynamic pivot in SQL Server 2008 with multiple columns.
我的样本表如下:
ID YEAR TYPE TOTAL VOLUME
DD1 2008 A 1000 10
DD1 2008 B 2000 20
DD1 2008 C 3000 30
DD1 2009 A 4000 40
DD1 2009 B 5000 50
DD1 2009 C 6000 60
DD2 2008 A 7000 70
DD2 2008 B 8000 80
DD2 2008 C 9000 90
DD2 2009 A 10000 100
DD2 2009 B 11000 110
DD2 2009 C 12000 120
我正在尝试如下操作:
ID 2008_A_TOTAL 2008_A_VOLUME 2008_B_TOTAL 2008_B_VOLUME 2008_C_TOTAL 2008_C_VOLUME 2009_A_TOTAL 2009_A_VOLUME 2009_B_TOTAL 2009_B_VOLUME 2009_C_TOTAL 2009_C_VOLUME
DD1 1000 10 2000 20 3000 30 4000 40 5000 50 6000 60
DD2 7000 70 8000 80 9000 90 10000 100 11000 110 12000 120
我的SQL Server 2008查询如下创建表:
My SQL Server 2008 query is as follows to create the table:
CREATE TABLE ATM_TRANSACTIONS
(
ID varchar(5),
T_YEAR varchar(4),
T_TYPE varchar(3),
TOTAL int,
VOLUME int
);
INSERT INTO ATM_TRANSACTIONS
(ID,T_YEAR,T_TYPE,TOTAL,VOLUME)
VALUES
('DD1','2008','A',1000,10),
('DD1','2008','B',2000,20),
('DD1','2008','C',3000,30),
('DD1','2009','A',4000,40),
('DD1','2009','B',5000,50),
('DD1','2009','C',6000,60),
('DD2','2008','A',7000,70),
('DD2','2008','B',8000,80),
('DD2','2008','C',9000,90),
('DD2','2009','A',10000,100),
('DD2','2009','B',11000,110),
('DD2','2009','C',1200,120);
T_Year列将来可能会发生变化，但是T_TYPE列通常是已知的，所以我不确定是否可以在SQL Server中将PIVOT函数与动态代码结合使用?
The T_Year column may change in the future but the T_TYPE column is generally know, so I'm not sure if I can use a combination of the PIVOT function in SQL Server with dynamic code?
我尝试了以下示例:
但是我最终得到了奇怪的结果.
but I ended up with with weird results.
推荐答案
为了获得结果，您需要首先查看将Total和Volume列中的数据取消透视，然后再将PIVOT函数应用于得到最终结果.我的建议是首先编写查询的硬编码版本，然后将其转换为动态SQL.
In order to get the result, you will need to look at unpivoting the data in the Total and Volume columns first before applying the PIVOT function to get the final result. My suggestion would be to first write a hard-coded version of the query then convert it to dynamic SQL.
UNPIVOT进程将这些多列转换为行.有几种方法可以使用UNPIVOT，可以使用UNPIVOT函数，也可以使用CROSS APPLY.取消数据透视的代码将类似于:
The UNPIVOT process converts these multiple columns into rows. There are a few ways to UNPIVOT, you can use the UNPIVOT function or you can use CROSS APPLY. The code to unpivot the data will be similar to:
select id,
col = cast(t_year as varchar(4))+'_'+t_type+'_'+col,
value
from ATM_TRANSACTIONS t
cross apply
(
select 'total', total union all
select 'volume', volume
) c (col, value);
这将为您提供以下格式的数据:
This gives you data in the format:
+-----+---------------+-------+
| id | col | value |
+-----+---------------+-------+
| DD1 | 2008_A_total | 1000 |
| DD1 | 2008_A_volume | 10 |
| DD1 | 2008_B_total | 2000 |
| DD1 | 2008_B_volume | 20 |
| DD1 | 2008_C_total | 3000 |
| DD1 | 2008_C_volume | 30 |
+-----+---------------+-------+
然后您可以应用PIVOT功能:
Then you can apply the PIVOT function:
select ID,
[2008_A_total], [2008_A_volume], [2008_B_total], [2008_B_volume],
[2008_C_total], [2008_C_volume], [2009_A_total], [2009_A_volume]
from
(
select id,
col = cast(t_year as varchar(4))+'_'+t_type+'_'+col,
value
from ATM_TRANSACTIONS t
cross apply
(
select 'total', total union all
select 'volume', volume
) c (col, value)
) d
pivot
(
max(value)
for col in ([2008_A_total], [2008_A_volume], [2008_B_total], [2008_B_volume],
[2008_C_total], [2008_C_volume], [2009_A_total], [2009_A_volume])
) piv;
现在您具有正确的逻辑，可以将其转换为动态SQL:
Now that you have the correct logic, you can convert this to dynamic SQL:
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT ',' + QUOTENAME(cast(t_year as varchar(4))+'_'+t_type+'_'+col)
from ATM_TRANSACTIONS t
cross apply
(
select 'total', 1 union all
select 'volume', 2
) c (col, so)
group by col, so, T_TYPE, T_YEAR
order by T_YEAR, T_TYPE, so
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT id,' + @cols + '
from
(
select id,
col = cast(t_year as varchar(4))+''_''+t_type+''_''+col,
value
from ATM_TRANSACTIONS t
cross apply
(
select ''total'', total union all
select ''volume'', volume
) c (col, value)
) x
pivot
(
max(value)
for col in (' + @cols + ')
) p '
execute sp_executesql @query;
这将为您提供结果:
+-----+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+
| id | 2008_A_total | 2008_A_volume | 2008_B_total | 2008_B_volume | 2008_C_total | 2008_C_volume | 2009_A_total | 2009_A_volume | 2009_B_total | 2009_B_volume | 2009_C_total | 2009_C_volume |
+-----+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+
| DD1 | 1000 | 10 | 2000 | 20 | 3000 | 30 | 4000 | 40 | 5000 | 50 | 6000 | 60 |
| DD2 | 7000 | 70 | 8000 | 80 | 9000 | 90 | 10000 | 100 | 11000 | 110 | 1200 | 120 |
+-----+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+--------------+---------------+
这篇关于SQL Server:5列以上的动态数据透视的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
