Question

我有下表（表1是基表），我需要派生一个新字段“ catid”和“ origid”。 “ Catid”只是（id和nv）的串联，但是origid是通过检查表1中是否存在表2中的（sid或sid2或sid3或sid4）而得出的。如果存在它们，只需将table1中的“ catid”分配给他们

具有表1：

id    nv   sid sid2 sid3  sid4
---------------------------------------    
1     a    11   A1   B1    C1        
2     b    22   A2   B2    (null)  
3     c    33    A3   B3    C3

表2：

id nv   sid     sid2   sid3    sid4         
---------------------------------------
4     x    11    (null)  B1     C1        
5     y   (null)  A2    B2      (null)    
6     z    33      A3   (null)    C3

要表3：

id  nv    sid   sid2   sid3  sid4   catid   origid  
--------------------------------------------------
1     a     11    A1    B1   C1      1a       1a
2     b     22    A2    B2   (null)  2b       2b
3     c     33    A3    B3   C3      3c       3c
4     x     11   (null) B1   C1      4x       1a
5     y  (null)  A2    B2   (null)   5y       2b
6     z     33    A3  (null)  C3     6z       3c

表1

create table table1 (
    id number,
    nv varchar2(2)
    sid varchar2(3),
    sid2 varchar2(3),
    sid3 varchar2(3),
    sid4 varchar2(3)
);

Table 2

create table table2 (
    id number,
    nv varchar2(2),
    sid varchar2(3),
    sid2 varchar2(3),
    sid3 varchar2(3),
    sid4 varchar2(3)
);

insert into table1 values(1, 'a', '11','A1','B1','C1');
insert into table1 values(2, 'b', '22','A2','B2','');
insert into table1 values(3, 'c', '33','A3','B3','C3');
insert into table2 values(4, 'x', '11','','B1','C1');
insert into table2 values(5, 'y', '','A2','B2','');
insert into table2 values(6, 'z', '33','A3','','C3');

谢谢

Answer 1

您需要某种join来执行此操作。这是一种方法：

with t1 as (
      select id, nv, sid, sid2, sid3, sid4,
             id || nv as catid, id || nv as origid
      from table1
     )
select id, nv, sid, sid2, sid3, sid4, catid, origid
from t1
union all
select id, nv, sid, sid2, sid3, sid4, id || nv as catid,
       (select t1.origid
        from t1
        where (t1.sid = t2.sid or t1.sid2 = t2.sid2 or
               t1.sid3 = t2.sid3 or t1.sid4 = t2.sid4
              ) and
              rownum = 1
       ) as origid
from table2 t2;

Here是db <>小提琴。

通过检查一张表中的各个字段来进行价值推导

1 个答案: