如何基于两个case语句的输出为视图创建两个其他字段

Question

嗨，我想用我的查询创建另外两个字段。 状态（活动/无效）和原因（BAU / EXPIRY）基于条件。 当前是一列，但我想将其分为两部分。 下面是代码：

select first_name,last_name,end_date as "Contract end date",date_removed,
case  
when END_DATE > sysdate and DATE_REMOVED is null then 'ACTIVE'  
when END_DATE <= sysdate then 'INACTIVE - Contract Expired' 
when DATE_REMOVED is not null then 'INACTIVE - BAU'
end 
as status
from DEPARTMENTS d inner join employees e on e.DEPARTMENT_ID = d.DEPARTMENT_ID

希望它显示

**STATUS**           **REASON**
ACTIVE           
ACTIVE           
INACTIVE         CONTRACT EXPIRY
INACTIVE         BAU
...               ...

Answer 1

根据您的样品...

select 
case when STATUS like '%ACTIVE%' is null then '' ,
   when STATUS like '%INACTIVE%'  and DATE_REMOVED is not null then 'BAU' 
   when STAUS like '%INACTIVE%' and END_DATE <= sysdate then 'Contract Expired'
end as REASON,
case when REASON IS NULL then 'ACTIVE'
    ESLE 'INACTIVE' end as STATUS

from (


select first_name,last_name,end_date as "Contract end date",date_removed,
case  
when END_DATE > sysdate and DATE_REMOVED is null then 'ACTIVE'  
when END_DATE <= sysdate then 'INACTIVE - Contract Expired' 
when DATE_REMOVED is not null then 'INACTIVE - BAU'
end 
as status
from DEPARTMENTS d inner join employees e on e.DEPARTMENT_ID = d.DEPARTMENT_ID)

Answer 2

做这个

     select a.*, substr(a.status,replace(instr(a.status,'-',1,1),0,LENGTH(a.status)) + 1) Reason from (select first_name,last_name,end_date as "Contract end date",date_removed,
     case  
     when END_DATE > sysdate and DATE_REMOVED is null then 'ACTIVE'  
     when END_DATE <= sysdate then 'INACTIVE - Contract Expired' 
     when DATE_REMOVED is not null then 'INACTIVE - BAU'
     end 
     as status
     from DEPARTMENTS d inner join employees e on e.DEPARTMENT_ID = d.DEPARTMENT_ID) a

Answer 3

我通常不会回答自己的问题，但是下面是我在寻找什么

select first_name,last_name,end_date,date_removed,
case  
when END_DATE > sysdate and DATE_REMOVED is null then 'ACTIVE'  
when END_DATE <= sysdate then 'INACTIVE' 
end 
as status,
case  
when END_DATE <= sysdate then 'Contract Expired' 
when DATE_REMOVED is not null then 'BAU'
end 
as Reason
from DEPARTMENTS d inner join employees e on e.DEPARTMENT_ID = d.DEPARTMENT_ID;