二、編寫一個程序塊，將emp表中前5人的名字

declare cursor s1 is select * from emp; v_res emp%rowtype; begin   open s1;   fetch s1 into v_res;    for a in 1..5 loop      dbms_output.put_line(v_res.ename);   fetch s1 into v_res;    end loop; clo

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