Hi Amit -
Depending on your requirement , you can create objects in HANA , For e.g. Stored procedures, Calc/Ana/Attr views, tables, functions etc
Within functions, stored procs and calculation views you can declare variables. e.g.
createfunction get_steet_num (person_id varchar(24))
returns street_number varchar(20) as
begin
declare address varchar(200);
select full_address into address from person_table where person_id = :person_id;
street_number := LEFT(:address,3) ;
end;