老师，这两个查询语句的查询结果是一样的，那他们之间有什么区别呢，工作中使用哪一种更好？

#工资等级为3级或4级的员工

#方法1

SELECT empno,ename,sal

FROM t_emp 

WHERE EXISTS

(SELECT grade FROM t_salgrade WHERE

 sal BETWEEN losal AND hisal AND grade IN (3,4))

#方法2

SELECT empno,ename,sal

FROM t_emp e,t_salgrade s

WHERE e.sal BETWEEN s.losal AND s.hisal AND s.grade IN (3,4)