text: /**
   * problem url: https://leetcode.com/problems/swap-salary/
   * leetcode profile url:  https://leetcode.com/jamsrandorj/
   * solved by jama
  **/
  
  
  /* Write your PL/SQL query statement below */
  UPDATE salary s
  SET s.sex = CASE 
              WHEN s.sex = 'm' THEN 'f' 
              WHEN s.sex = 'f' THEN 'm' END;
              