PIVOT XML - 动态提取字段到列

Question

我在这个主题上发布了一个原始问题：

PIVOT Oracle - transform multiple row data to single row with multiple columns, no aggregate data enter link description here

我想要的结果是使用以下声明实现的：

select * from (
select "Date", subcat,category,item,tag,value from TEST2 where tag in ('LN','SN')
)
PIVOT 
(
  max(value)
  for tag in ('LN','SN')
)
order by category,subcat,item,"Date"

但是，我想扩展解决方案以使其更灵活并接受IN子句中的动态选择。 Oracle不喜欢它并抛出错误。我被指示使用pivot xml。经过一番研究，我想出了这个陈述：

select * from (
select "Date", subcat,category,item,tag,value from TEST2 
where tag in 
   (
    Select 'LN' from dual 
     union 
    select 'SN' from dual
    )
)
PIVOT xml
(
  max(value)
  for tag in (any)
)
order by category,subcat,item,"Date"

但我必须提取出我想要的字段，我不熟悉如何继续。请帮忙。

我想要的最终结果仍然是相同的：

使用PIVOT XML，我得到了一堆丑陋的xml标签！

与我的问题相关的数据是：

  CREATE TABLE "TEST2" 
   (    "Date" DATE, 
    "SUBCAT" VARCHAR2(6 BYTE), 
    "CATEGORY" VARCHAR2(7 BYTE), 
    "VALUE" VARCHAR2(17 BYTE), 
    "ITEM" VARCHAR2(2 BYTE), 
    "DESCRIPTION" VARCHAR2(15 BYTE), 
    "TAG" VARCHAR2(3 BYTE)
   ) 



Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'25','OTHER ATTRIBUTE','OA');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'25','SOME COMMENTS','SC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','1105618','25','Lot Number','LN');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','12','25','NOT RELEVANT','NR');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','45','25','NOT USE','NU');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','-1','25','DO NOT CARE','DC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','3x12mm','25','Serial Number','SN');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'25','ABC','ABC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'25','Whatever','DEF');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'28','SOME ATTRIBUTE','SA');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'28','OTHER ATTRIBUTE','OA');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','isq: 75, 80','28','Other Comments','OC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'28','SOME COMMENTS','SC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','1303757','28','Lot Number','LN');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','12','28','NOT RELEVANT','NR');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','40','28','NOT USE','NU');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576','0','28','DO NOT CARE','DC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'28','ABC','ABC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('24-OCT-13','DD-MON-RR'),'290223','1219576',null,'28','Whatever','DEF');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576',null,'4','SOME ATTRIBUTE','SA');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576',null,'4','OTHER ATTRIBUTE','OA');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','1403114','4','Lot Number','LN');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','11','4','NOT RELEVANT','NR');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','50','4','NOT USE','NU');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','0','4','DO NOT CARE','DC');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576',null,'4','Whatever','DEF');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','7777777777','9','Lot Number','LN');
Insert into TEST2 ("Date",SUBCAT,CATEGORY,VALUE,ITEM,DESCRIPTION,TAG) values (to_date('18-JUN-15','DD-MON-RR'),'354506','1219576','9.999999999999E12','9','Serial Number','SN');

Answer 1

  

...接受IN子句中的动态选择...

没有XML-pivoting就不可能。

根据您接下来需要对结果集执行的操作，您的选项是

1. 使用XSLT将转动的XML转换为您需要的任何内容。
2. 而不是XML-pivot，在运行时构造您的查询的pivot IN子句（并使其成为游标，插入/选择，CTAS，......无论您需要什么。）

Answer 2

from IPython.display import Image
Image('yourimage.png')

Here is one hack that works