根据另一个 table 的序列从另一个获取序列字段

Question

我有两个table 表 1

SETID  CRSE_ID COMPONENT CAMPUS 
A      10001   LAB        C1
A      10002   LEC        C1
A      10003   LAB        C1
A      10004   LAB        C1

表 2

SETID  ITEM TYPE      DESCR   CAMPUS
A      300000220010   Book    C1
A      300000220020   Book    C2
A      300000220030   Book    C1
A      300000220040   Book    C2
A      300000220050   Book    C1
A      300000220060   Book    C2
A      300000220070   Book    C1

我想获得项目类型映射到每一行的结果

SETID  CRSE_ID COMPONENT CAMPUS ITEM_TYPE
A      10001   LAB        C1    300000220010   
A      10001   LEC        C1    300000220030   
A      10001   LAB        C1    300000220050   
A      10001   LAB        C1    300000220070 
A      10002   LAB        C1    300000220010   
A      10002   LEC        C1    300000220030   
A      10002   LAB        C1    300000220050   
A      10002   LAB        C1    300000220070
A      10003   LAB        C1    300000220010   
A      10003   LEC        C1    300000220030   
A      10003   LAB        C1    300000220050   
A      10003   LAB        C1    300000220070
A      10004   LAB        C1    300000220010   
A      10004   LEC        C1    300000220030   
A      10004   LAB        C1    300000220050   
A      10004   LAB        C1    300000220070

项目类型的序列随着新的CRSE_ID而不断增加。 Campus C1 的项目类型以奇数结尾

Answer 1

我认为您只是想添加一个序列号并将其用作join条件之一：

select t1.*, t2.item_type
from (select t1.*, row_number() over (partition by setid, campus order by setid) as seqnum
      from table1 t1
     ) t1 left join
     (select t2.*, row_number() over (partition by setid, campus order by setid) as seqnum
      from table2 t2
     ) t2
     on t1.setid = t2.setid and t1.campus = t2.campus and t1.seqnum = t2.seqnum;

根据另一个 table 的序列从另一个获取序列字段

Getting sequential field from another based on Sequence from another table

sql

oracle

row-number

dense-rank