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create or replace type mytype IS TABLE OF varchar2(20);
declare type1 mytype :=mytype('1','2','3','4');
i number:=1;
var_str varchar(20):='liaomin';
begin
type1.EXTEND;
type1(type1.COUNT):=var_str;
loop
  dbms_output.put_line(type1(i));
  i:=i+1;
  exit when i=type1.count+1;
 end loop;
end;
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