Create 569-median-employee-salary.sql

Author: everthis

569-median-employee-salary.sql

@@ -0,0 +1,14 @@
+# Write your MySQL query statement below
+SELECT a.Id, a.Company, a.Salary
+FROM (
+    SELECT e.Id, e.Company, e.Salary,
+        IF(@prev = e.Company, @rank := @rank+1, @rank := 1) AS Ranking,
+        @prev := e.Company
+    FROM Employee e, (SELECT @rank := 0, @prev := 0) AS t
+    ORDER BY e.Company, e.Salary #, e.Id
+) AS a, (
+    SELECT Company, COUNT(*) AS cnt
+    FROM Employee
+    GROUP BY Company
+) AS b
+WHERE a.Company = b.Company AND Ranking IN (FLOOR((cnt+1)/2), FLOOR((cnt+2)/2));