SAS Proc SQL，结合在哪里，左连接和案例

Question

我有三段代码。如何将它们组合成一个以使它们看起来优雅？ data1：在某种条件下提取数据; data2：data1左边加入新数据; data3：设置为data2并创建一个新变量。

proc sql; create table data1 as select
a.ID,
b.decison_CD,
c.type,

from
dataA  a,
dataB  b,
dataC  c,

where a.ID=b.ID
and   a.ID=c.ID
and   c.type not in ('Unknown')
and   b.decison_CD in (‘Y’,’N’)
; quit;


proc sql;
create table data2 as select 
a.*
,b.payId

from data1 a
left join datanew b
on a.ID=b.ID;
quit;

data data3;
set data2;
if payID= . then booked =0;
else if payID=1 then booked=1;
run;

Answer 1

看起来您可以使用左连接并将datanew视为第四个数据集：

proc sql;
    create table data1 as select
        a.ID, b.decison_CD, c.type, d.payId,
        case when missing(d.payId) then 0 else
            case when d.payID = 1 then 1 end end as booked
        from dataA as a
        left join dataB (where = (decision_CD in('Y','N'))) as b on a.id = b.id
        left join dataC (where = (type notin('Unknown'))) as c on a.id = c.id
        left join datanew as d on a.id = d.id;
quit;