为什么CASE WHEN语句组有类似的变量（SAS PROC SQL）

Question

当我使用像这样的声明的案例时：

...

, case when majcat in (1,2,3,4,5) then "Inpatient"
       when majcat in (3) then "IP-Surgical"
       else "N/A" end as serv_cat

服务器没有将Inpatient和IP-Surgical分开，将它们组合在一起。为什么会发生这种情况？我该如何解决？

以下是上下文的完整代码：

proc sql;
create table raw_claims_summ as
select pcp_npi
      , pcp_name
      , practice_name
      , rpt_cut_1
      , rpt_cut_2
      , sum(paid)
      , sum(admits)
      , sum(days)
      , sum(units)
      , case when majcat in (1,2,3,4,5) then "Inpatient"
             when majcat in (3) then "IP-Surgical"
             else "N/A" end as serv_cat
 from raw_claims
 group by 1,2,3,4,5,10
 order by 1
;quit;

Answer 1

您应该从第一个when子句中删除3：

CASE WHEN majcat IN (1, 2, 4, 5) THEN "Inpatient"
     -- 3 removed here ---^
     WHEN majcat in (3) THEN "IP-Surgical"
     ELSE "N/A" 
END AS serv_cat