create table insure_pol_ssumm 
(
  policy_no       varchar2(50),
  location_code   number(10),
  issue_dt        date
);

create index idx_location_code on insure_pol_ssumm(location_code);

create index idx_issue_dt on insure_pol_ssumm(issue_dt);

query1 ) select policy_no /*+ index (  idx_location_code) */ from insure_pol_ssumm where  location_code=1901

query2 ) select policy_no from insure_pol_ssumm where  location_code=1901 						   
query1 and query2 going to full table scan why?