【Oracle】Oracle分析函数PERCENTILE_CONT

编辑小王

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。

1. create table EMP
   
2. (
   
3. EMPNO NUMBER(4) not null,
   
4. ENAME VARCHAR2(10),
   
5. JOB VARCHAR2(9),
   
6. MGR NUMBER(4),
   
7. HIREDATE DATE,
   
8. SAL NUMBER(7,2),
   
9. COMM NUMBER(7,2),
   
10. DEPTNO NUMBER(2)
    
11. );
    
12. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
13. values (7369, 'SMITH', 'CLERK', 7902, to_date('17-12-1980', 'dd-mm-yyyy'), 800.00, null, 20);
    
14. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
15. values (7499, 'ALLEN', 'SALESMAN', 7698, to_date('20-02-1981', 'dd-mm-yyyy'), 1600.00, 300.00, 30);
    
16. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
17. values (7521, 'WARD', 'SALESMAN', 7698, to_date('22-02-1981', 'dd-mm-yyyy'), 1250.00, 500.00, 30);
    
18. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
19. values (7566, 'JONES', 'MANAGER', 7839, to_date('02-04-1981', 'dd-mm-yyyy'), 2975.00, null, 20);
    
20. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
21. values (7654, 'MARTIN', 'SALESMAN', 7698, to_date('28-09-1981', 'dd-mm-yyyy'), 1250.00, 1400.00, 30);
    
22. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
23. values (7698, 'BLAKE', 'MANAGER', 7839, to_date('01-05-1981', 'dd-mm-yyyy'), 2850.00, null, 30);
    
24. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
25. values (7782, 'CLARK', 'MANAGER', 7839, to_date('09-06-1981', 'dd-mm-yyyy'), 2450.00, null, 10);
    
26. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
27. values (7788, 'SCOTT', 'ANALYST', 7566, to_date('19-04-1987', 'dd-mm-yyyy'), 3000.00, null, 20);
    
28. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
29. values (7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981', 'dd-mm-yyyy'), 5000.00, null, 10);
    
30. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
31. values (7844, 'TURNER', 'SALESMAN', 7698, to_date('08-09-1981', 'dd-mm-yyyy'), 1500.00, 0.00, 30);
    
32. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
33. values (7876, 'ADAMS', 'CLERK', 7788, to_date('23-05-1987', 'dd-mm-yyyy'), 1100.00, null, 20);
    
34. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
35. values (7900, 'JAMES', 'CLERK', 7698, to_date('03-12-1981', 'dd-mm-yyyy'), 950.00, null, 30);
    
36. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
37. values (7902, 'FORD', 'ANALYST', 7566, to_date('03-12-1981', 'dd-mm-yyyy'), 3000.00, null, 20);
    
38. insert into emp (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
    
39. values (7934, 'MILLER', 'CLERK', 7782, to_date('23-01-1982', 'dd-mm-yyyy'), 1300.00, null, 10);
    
40. commit;
    
41. 
    
42. SQL> select e.ename,e.sal,e.deptno,
    
43. 
    
44. percent_rank() over(partition by deptno order by sal desc) p_rank,
    
45. PERCENTILE_CONT(0) within group(order by sal desc)
    
46. over(partition by deptno) max_sal ,
    
47. PERCENTILE_CONT(0.25) within group(order by sal desc)
    
48. over(partition by deptno) max_sal_25,
    
49. PERCENTILE_CONT(0.5) within group(order by sal desc)
    
50. over(partition by deptno) max_sal_50,
    
51. PERCENTILE_CONT(0.75) within group(order by sal desc)
    
52. over(partition by deptno) max_sal_75
    
53. from emp e;
    
54. ENAME SAL DEPTNO P_RANK MAX_SAL MAX_SAL_25 MAX_SAL_50 MAX_SAL_75
    
55. ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
    
56. KING 5000 10 0 5000 3725 2450 1875
    
57. CLARK 2450 10 .5 5000 3725 2450 1875
    
58. MILLER 1300 10 1 5000 3725 2450 1875
    
59. SCOTT 3000 20 0 3000 3000 2975 1100
    
60. FORD 3000 20 0 3000 3000 2975 1100
    
61. JONES 2975 20 .5 3000 3000 2975 1100
    
62. ADAMS 1100 20 .75 3000 3000 2975 1100
    
63. SMITH 800 20 1 3000 3000 2975 1100
    
64. BLAKE 2850 30 0 2850 1575 1375 1250
    
65. ALLEN 1600 30 .2 2850 1575 1375 1250
    
66. TURNER 1500 30 .4 2850 1575 1375 1250
    
67. WARD 1250 30 .6 2850 1575 1375 1250
    
68. MARTIN 1250 30 .6 2850 1575 1375 1250
    
69. JAMES 950 30 1 2850 1575 1375 1250
    
70. 已选择14行。
    
71. 
    
72. 
    
73. SQL> select e.ename,e.sal,e.deptno,
    
74. percent_rank() over(partition by deptno order by sal) p_rank,
    
75. PERCENTILE_CONT(0) within group(order by sal)
    
76. over(partition by deptno) max_sal ,
    
77. PERCENTILE_CONT(0.25) within group(order by sal)
    
78. over(partition by deptno) max_sal_25,
    
79. PERCENTILE_CONT(0.5) within group(order by sal)
    
80. over(partition by deptno) max_sal_50,
    
81. PERCENTILE_CONT(0.75) within group(order by sal)
    
82. over(partition by deptno) max_sal_75
    
83. from emp e;
    
84. ENAME SAL DEPTNO P_RANK MAX_SAL MAX_SAL_25 MAX_SAL_50 MAX_SAL_75
    
85. ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
    
86. MILLER 1300 10 0 1300 1875 2450 3725
    
87. CLARK 2450 10 .5 1300 1875 2450 3725
    
88. KING 5000 10 1 1300 1875 2450 3725
    
89. SMITH 800 20 0 800 1100 2975 3000
    
90. ADAMS 1100 20 .25 800 1100 2975 3000
    
91. JONES 2975 20 .5 800 1100 2975 3000
    
92. SCOTT 3000 20 .75 800 1100 2975 3000
    
93. FORD 3000 20 .75 800 1100 2975 3000
    
94. JAMES 950 30 0 950 1250 1375 1575
    
95. MARTIN 1250 30 .2 950 1250 1375 1575
    
96. WARD 1250 30 .2 950 1250 1375 1575
    
97. TURNER 1500 30 .6 950 1250 1375 1575
    
98. ALLEN 1600 30 .8 950 1250 1375 1575
    
99. BLAKE 2850 30 1 950 1250 1375 1575
    
100. 已选择14行。

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