oracle数据库的percentile,Oracle分析函数PERCENTILE_CONT
查询各部门中薪水分布处于25%、50%、75%位置的人的薪水，percent_rank()是确定排行中的相对位置。create table EMP(EMPNONUMBER(4) not null,ENAMEVARCHAR2(10),JOBVARCHAR2(9),MGRNUMBER(4),HIREDATE DATE,SALNUMBER(7,2),C...
查询各部门中薪水分布处于25%、50%、75%位置的人的薪水，percent_rank()是确定排行中的相对位置。
create table EMP
(
EMPNO NUMBER(4) not null,
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
MGR NUMBER(4),
HIREDATE DATE,
SAL NUMBER(7,2),
COMM NUMBER(7,2),
DEPTNO NUMBER(2)
);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7369, 'SMITH', 'CLERK', 7902, to_date('17-12-1980', 'dd-mm-yyyy'), 800.00, null, 20);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7499, 'ALLEN', 'SALESMAN', 7698, to_date('20-02-1981', 'dd-mm-yyyy'), 1600.00, 300.00, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7521, 'WARD', 'SALESMAN', 7698, to_date('22-02-1981', 'dd-mm-yyyy'), 1250.00, 500.00, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7566, 'JONES', 'MANAGER', 7839, to_date('02-04-1981', 'dd-mm-yyyy'), 2975.00, null, 20);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7654, 'MARTIN', 'SALESMAN', 7698, to_date('28-09-1981', 'dd-mm-yyyy'), 1250.00, 1400.00, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7698, 'BLAKE', 'MANAGER', 7839, to_date('01-05-1981', 'dd-mm-yyyy'), 2850.00, null, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7782, 'CLARK', 'MANAGER', 7839, to_date('09-06-1981', 'dd-mm-yyyy'), 2450.00, null, 10);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7788, 'SCOTT', 'ANALYST', 7566, to_date('19-04-1987', 'dd-mm-yyyy'), 3000.00, null, 20);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981', 'dd-mm-yyyy'), 5000.00, null, 10);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7844, 'TURNER', 'SALESMAN', 7698, to_date('08-09-1981', 'dd-mm-yyyy'), 1500.00, 0.00, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7876, 'ADAMS', 'CLERK', 7788, to_date('23-05-1987', 'dd-mm-yyyy'), 1100.00, null, 20);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7900, 'JAMES', 'CLERK', 7698, to_date('03-12-1981', 'dd-mm-yyyy'), 950.00, null, 30);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7902, 'FORD', 'ANALYST', 7566, to_date('03-12-1981', 'dd-mm-yyyy'), 3000.00, null, 20);
insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
values (7934, 'MILLER', 'CLERK', 7782, to_date('23-01-1982', 'dd-mm-yyyy'), 1300.00, null, 10);
commit;
SQL> select e.ename,e.sal,e.deptno,
percent_rank() over(partition by deptno order by sal desc) p_rank, PERCENTILE_CONT(0) within group(order by sal desc) over(partition by deptno) max_sal , PERCENTILE_CONT(0.25) within group(order by sal desc) over(partition by deptno) max_sal_25, PERCENTILE_CONT(0.5) within group(order by sal desc) over(partition by deptno) max_sal_50, PERCENTILE_CONT(0.75) within group(order by sal desc) over(partition by deptno) max_sal_75 from emp e; ENAME SAL DEPTNO P_RANK MAX_SAL MAX_SAL_25 MAX_SAL_50 MAX_SAL_75 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- KING 5000 10 0 5000 3725 2450 1875 CLARK 2450 10 .5 5000 3725 2450 1875 MILLER 1300 10 1 5000 3725 2450 1875 SCOTT 3000 20 0 3000 3000 2975 1100 FORD 3000 20 0 3000 3000 2975 1100 JONES 2975 20 .5 3000 3000 2975 1100 ADAMS 1100 20 .75 3000 3000 2975 1100 SMITH 800 20 1 3000 3000 2975 1100 BLAKE 2850 30 0 2850 1575 1375 1250 ALLEN 1600 30 .2 2850 1575 1375 1250 TURNER 1500 30 .4 2850 1575 1375 1250 WARD 1250 30 .6 2850 1575 1375 1250 MARTIN 1250 30 .6 2850 1575 1375 1250 JAMES 950 30 1 2850 1575 1375 1250 已选择14行。 SQL> select e.ename,e.sal,e.deptno, percent_rank() over(partition by deptno order by sal) p_rank, PERCENTILE_CONT(0) within group(order by sal) over(partition by deptno) max_sal , PERCENTILE_CONT(0.25) within group(order by sal) over(partition by deptno) max_sal_25, PERCENTILE_CONT(0.5) within group(order by sal) over(partition by deptno) max_sal_50, PERCENTILE_CONT(0.75) within group(order by sal) over(partition by deptno) max_sal_75 from emp e; ENAME SAL DEPTNO P_RANK MAX_SAL MAX_SAL_25 MAX_SAL_50 MAX_SAL_75 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- MILLER 1300 10 0 1300 1875 2450 3725 CLARK 2450 10 .5 1300 1875 2450 3725 KING 5000 10 1 1300 1875 2450 3725 SMITH 800 20 0 800 1100 2975 3000 ADAMS 1100 20 .25 800 1100 2975 3000 JONES 2975 20 .5 800 1100 2975 3000 SCOTT 3000 20 .75 800 1100 2975 3000 FORD 3000 20 .75 800 1100 2975 3000 JAMES 950 30 0 950 1250 1375 1575 MARTIN 1250 30 .2 950 1250 1375 1575 WARD 1250 30 .2 950 1250 1375 1575 TURNER 1500 30 .6 950 1250 1375 1575 ALLEN 1600 30 .8 950 1250 1375 1575 BLAKE 2850 30 1 950 1250 1375 1575 已选择14行。
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