查询工资排名前三的员工姓名和工资（sql和plsql两种方法实现）
select ename,sal from emp where empno in (select empno from (select empno,sal from emp order by sal desc )t where rownum<4);
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declare v_name varchar2(10); v_sal number(5); cursor emp_cursor is select ename,sal from emp order by sal desc; begin open emp_cursor; for i in 1..3 loop fetch emp_cursor into v_name,v_sal; dbms_output.put_line(v_name||','||v_sal); end loop; close emp_cursor; end;
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