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我有表（EMP_EIT_EXT）：逆透视查询与下面的多列
EMPLOYEE_NUMBER Next Academic Rank Max Academic Rank Max Score Academic Rank Promotion Rank ACADEMIC_RANK_START_DATE ACADEMIC_RANK_END_DATE Income_code Date(YYYY) Date(MON) Date(DD) Amount Tax? INCOME_START_DATE INCOME_END_DATE
--------------- ------------------ ------------------ ---------- ------------- -------------- ------------------------ ------------------ ----------- --------- --------- --------- ------ ----- ----------------- -------------------
33333 Professor Y 10.1 Ass.Professor Y 01-JAN-2017 31-DEC-4712 P 2017 JAN 01 10000 Tax 01-JAN-2017 31-DEC-4712
44444 Ass.Professor N 9.7 Student N 01-JAN-2017 31-DEC-4712 R 2017 JAN 17 50000 Non-Tax 01-JAN-2017 31-DEC-4712
我怎样才能UNPIVOT这使它在垂直方向像下面？
EMPLOYEE_NUMBER EXTRA_INFORMATION INFORMATION_CATEGORY INFORMATION1 INFORMATION2 INFORMATION3
------------------- --------------------- ---------------------- -------------- ------------- ------------
33333 Academic Rank Next Academic Rank Professor Y 10.1
33333 Academic Rank Academic Rank Ass.Professor N Y
33333 Academic Rank Effective Start Date 01-JAN-2017 (NULL) (NULL)
33333 Academic Rank Effective End Date 31-DEC-4712 (NULL) (NULL)
33333 Alien Income Forecast Income_code P (NULL) (NULL)
33333 Alien Income Forecast Date 2017 01 JAN
33333 Alien Income Forecast Amount 10000 Tax (NULL)
33333 Alien Income Forecast Effective Start Date 01-JAN-2017 (NULL) (NULL)
33333 Alien Income Forecast Effective End Date 31-DEC-4712 (NULL) (NULL)
44444 Academic Rank Next Academic Rank Ass.Professor N 9.7
44444 Academic Rank Academic Rank Student N (NULL)
44444 Academic Rank Effective Start Date 01-JAN-2017 (NULL) (NULL)
44444 Academic Rank Effective End Date 31-DEC-4712 (NULL) (NULL)
44444 Alien Income Forecast Income_code R (NULL) (NULL)
44444 Alien Income Forecast Date 2017 17 JAN
44444 Alien Income Forecast Amount 50000 Non-Tax (NULL)
44444 Alien Income Forecast Effective Start Date 01-JAN-2017 (NULL) (NULL)
44444 Alien Income Forecast Effective End Date 31-DEC-4712 (NULL) (NULL)
样品DDL和DML
CREATE TABLE EMP_EIT_EXT
(
EMPLOYEE_NUMBER VARCHAR2(250),
Next_Academic_Rank VARCHAR2(250),
Max_Academic_Rank VARCHAR2(250),
Max_Score VARCHAR2(250),
Academic_Rank VARCHAR2(250),
Promotion_Rank VARCHAR2(250),
ACADEMIC_RANK_START_DATE VARCHAR2(250),
ACADEMIC_RANK_END_DATE VARCHAR2(250),
Income_code VARCHAR2(250),
Date_YYYY VARCHAR2(250),
Date_MON VARCHAR2(250),
Date_DD VARCHAR2(250),
Amount VARCHAR2(250),
Tax VARCHAR2(250),
INCOME_START_DATE VARCHAR2(250),
INCOME_END_DATE VARCHAR2(250)
);
INSERT INTO EMP_EIT_EXT (EMPLOYEE_NUMBER,Next_Academic_Rank,Max_Academic_Rank,Max_Score,Academic_Rank,Promotion_Rank,ACADEMIC_RANK_START_DATE ,ACADEMIC_RANK_END_DATE,Income_code,Date_YYYY,Date_MON,Date_DD,Amount,Tax,INCOME_START_DATE,INCOME_END_DATE)
VALUES('33333','Professor','Y','10.1','Ass.Professor','Y','01-JAN-2017','31-DEC-4712','P','2017','JAN','01','10000','Tax','01-JAN-2017','31-DEC-4712');
INSERT INTO EMP_EIT_EXT (EMPLOYEE_NUMBER,Next_Academic_Rank,Max_Academic_Rank,Max_Score,Academic_Rank,Promotion_Rank,ACADEMIC_RANK_START_DATE ,ACADEMIC_RANK_END_DATE,Income_code,Date_YYYY,Date_MON,Date_DD,Amount,Tax,INCOME_START_DATE,INCOME_END_DATE)
VALUES('44444','Ass.Professor','N','9.7','Student','N','01-JAN-2017','31-DEC-4712','R','2017','JAN','17','50000','Non-Tax','01-JAN-2017','31-DEC-4712');
我知道这可以通过UNION或UNION ALL来实现，但我想如果可能的话使用UNPIVOT。
所以一个问题是，规则从何而来？ UNPIVOT查询将如何知道INFO CAT“下一个学术排名”属于额外信息“学术排名”，但“Income_code”属于“外部收入预测”？它如何知道“外部收入预测::日期”需要三个INFORMATION * n *列，但“学术排名：有效开始日期”只有一个？ – APC
@APC，这是我有同样的问题。没有这些规则的参考表，它的所有用户定义。有小费吗？谢谢！ –
我唯一的提示是“不要这样做”。如果您认为将电子表格数据转换为[这个可怕的EAV变体]（http://stackoverflow.com/a/876459/146325）很难，请等到您必须开始编写查询以返回数据。 – APC