Update computedepth.sql

Author: absognety

Mastek/computedepth.sql

@@ -1 +1,14 @@
+-- MySQL solution
 
+WITH RECURSIVE cte AS (
+   SELECT 1 AS lvl, ManagerID, EmployeeID
+   FROM employees
+   WHERE ManagerID IS NULL
+   UNION ALL
+   SELECT lvl + 1, employees.ManagerID, employees.EmployeeID
+   FROM employees
+   JOIN cte
+     ON employees.ManagerID = cte.EmployeeID
+)
+SELECT *
+FROM cte;