Using the ROW_NUMBER with group by


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 job, ROW_NUMBER() over(order by max(sal)) from emp group by job;

JOB       ROW_NUMBER()OVER(ORDERBYMAX(SAL))
--------- ---------------------------------
CLERK                                     1
SALESMAN                                  2
MANAGER                                   3
ANALYST                                   4
PRESIDENT                                 5

SQL>
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ROW_NUMBER:
  1. ROW_NUMBER
  2. Get top n rows with row_number
  3. NULL and row_number
  4. Place NULLS FIRST in ROW_NUMBER
  5. Place NULLS LAST in ROW_NUMBER
  6. Using the ROW_NUMBER with group by
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