Begin Dbms_output.put_line('Heello World'); exception when others then Dbms_output.put_line('error'); end; /

Begin null; End;

Declare a varchar2(100) := 'Hello World'; Begin Dbms_output.put_line(a); exception when others then Dbms_output.put_line('error'); end; /

begin Dbms_output.put_line('Heello World'); end; /