RATIO_TO_REPORT
RATIO_TO_REPORT() computes the ratio of a value to the sum of a set of values.
You can perform reporting with: SUM(), AVG(), MAX(), MIN(),COUNT(), VARIANCE(), and STDDEV().
RATIO_TO_REPORT performs calculations across groups and partitions within groups.
CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
SAL NUMBER(7, 2),
DEPTNO NUMBER(2));
INSERT INTO EMP VALUES (1, 'SMITH', 'CLERK', 800, 20);
INSERT INTO EMP VALUES (2, 'ALLEN', 'SALESMAN', 1600, 30);
INSERT INTO EMP VALUES (3, 'WARD', 'SALESMAN', 1250, 30);
INSERT INTO EMP VALUES (4, 'JONES', 'MANAGER', 2975, 20);
INSERT INTO EMP VALUES (5, 'MARTIN','SALESMAN', 1250, 30);
INSERT INTO EMP VALUES (6, 'BLAKE', 'MANAGER', 2850, 30);
INSERT INTO EMP VALUES (7, 'CLARK', 'MANAGER', 2850, 10);
INSERT INTO EMP VALUES (8, 'SCOTT', 'ANALYST', 3000, 20);
INSERT INTO EMP VALUES (9, 'KING', 'PRESIDENT',3000, 10);
INSERT INTO EMP VALUES (10,'TURNER','SALESMAN', 1500, 30);
INSERT INTO EMP VALUES (11,'ADAMS', 'CLERK', 1500, 20);
SQL> SELECT deptno, job, SUM(sal) AS prd_type_amount,
2 RATIO_TO_REPORT(SUM(sal)) OVER (PARTITION BY deptno)
3 FROM emp
4 GROUP BY deptno, job
5 ORDER BY deptno, job;
DEPTNO JOB PRD_TYPE_AMOUNT RATIO_TO_REPORT(SUM(SAL))OVER(PARTITIONBYDEPTNO)
---------- --------- ---------------------------------------------------------------
10 MANAGER 2850 .487179487
10 PRESIDENT 3000 .512820513
20 ANALYST 3000 .362537764
20 CLERK 2300 .277945619
20 MANAGER 2975 .359516616
30 MANAGER 2850 .337278107
30 SALESMAN 5600 .662721893
7 rows selected.
SQL>