Oracle Analytic function for min value in grouping

Question

I\'m new to working with analytic functions.

DEPT EMP   SALARY
---- ----- ------
  10 MARY  100000
  10 JOHN  200000
  10 SCOTT 300000
  20 BOB   100000
  20 BET         


        

Answer 1

You can use the RANK() syntax. For example, this query will tell you where an employee ranks within their department with regard to how large their salary is:

SELECT
  dept,
  emp,
  salary,
  (RANK() OVER (PARTITION BY dept ORDER BY salary)) salary_rank_within_dept
FROM EMPLOYEES

You could then query from this where salary_rank_within_dept = 1:

SELECT * FROM
  (
    SELECT
      dept,
      emp,
      salary,
      (RANK() OVER (PARTITION BY dept ORDER BY salary)) salary_rank_within_dept
    FROM EMPLOYEES
  )
WHERE salary_rank_within_dept = 1