Proc sql;
create table C as
select COALESCE(A.company_ID, B.Company_ID) as Company_ID,
A.Date01,
B.Date02,
A.Insider,
B.volume,
B.Price
from work.a A
full join work.b B
on A.company_ID=B.Company_ID
and A.date01=B.date02;
quit;


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