PL/SQL练习题三(分析函数)

SELECT empno,ename,COUNT(*) OVER (PARTITION BY deptno ORDER BY sal)
FROM emp;

select deptno,empno,ename,  sal,rank() over
(partition by deptno order by sal desc) as rank_value
from emp

SELECT dep_id,emp_id
FROM (
SELECT dep_id,RANK() OVER (PARTITION BY dep_id ORDER BY salary DESC) rank_num,emp_id
FROM employee)
WHERE rank_num <= 2