declare
  table_or_view_doesnt_exist exception;

  pragma exception_init ( table_or_view_doesnt_exist, -942 );
  object_doesnt_exist exception;
  pragma exception_init ( object_doesnt_exist, -4043 );
begin
  begin

    execute immediate 'drop table employees_0';
  exception when table_or_view_doesnt_exist then null; end;
  begin
    execute immediate 'drop table employees_2';
  exception when table_or_view_doesnt_exist then null; end;
  begin

    execute immediate 'drop package Emp_Util';
  exception when object_doesnt_exist then null; end;
end;
/