Sql query to achive the running division

Question

Hi all, plz help me out with the sql query to achive the below output
create table emp_a (empno number, deptno number, sal number)
insert into emp_a values(901, 10,100);
insert into emp_a values(902, 10,400);
insert into emp_a values(901, 20,300);
insert into emp_a values(902, 20,2100);
i want the ouput in below format
empno deptno sal div_sal
901 10 100 (300/100)
901 20 300 (300/100)
902 10 400 (2100/400)
902 20 2100 (2100/400)
the div_sal column should have the output of greatest sal/second smallest sal for each empno

Answer 1

Hi,
781649 wrote:
Hi all, plz help me out with the sql query to achive the below output
create table emp_a (empno number, deptno number, sal number)
insert into emp_a values(901, 10,100);
insert into emp_a values(902, 10,400);
insert into emp_a values(901, 20,300);
insert into emp_a values(902, 20,2100);
i want the ouput in below format
empno deptno sal div_sal
901 10 100 (300/100)
901 20 300 (300/100)
902 10 400 (2100/400)
902 20 2100 (2100/400)
the div_sal column should have the output of greatest sal/second smallest sal for each empnofor empno=901, then second smallest sal is 300. For empno=902, the second smallest sal is 2100.
Instead of "second *smallest* ", do you mean "second *greatest* "?
What if there's a tie (e.g.
INSERT INTO emp_a (empno, deptno, sal) VALUES (903, 10, 300);
INSERT INTO emp_a (empno, deptno, sal) VALUES (903, 20, 300);
INSERT INTO emp_a (empno, deptno, sal) VALUES (903, 30, 200);) Would you count 200 or 300 as the second greatest?
Here's one way:
WITH     got_r_num     AS
     SELECT     empno, deptno, sal
     ,     ROW_NUMBER () OVER ( PARTITION BY  empno
                               ORDER BY          sal     DESC
                       )         AS r_num
     FROM    emp_a
SELECT       e.empno
,       e.deptno
,       e.sal
,       '(' || TO_CHAR (r1.sal)
           || '/'
           || TO_CHAR (r2.sal)
           || ')'          AS div_sal
FROM       emp_a           e
JOIN       got_r_num     r1  ON      e.empno     = r1.empno
JOIN       got_r_num     r2  ON   e.empno     = r2.empno
WHERE       r1.r_num     = 1
AND       r2.r_num     = 2
;