Added tasks 183-185.

Author: javadev

src/main/java/g0101_0200/s0183_customers_who_never_order/script.sql

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+# Write your MySQL query statement below
+SELECT c.Name as Customers 
+FROM Customers as c
+LEFT JOIN Orders as o
+ON c.Id = o.CustomerId  
+WHERE o.CustomerId is null

src/main/java/g0101_0200/s0184_department_highest_salary/script.sql

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+# Write your MySQL query statement below
+SELECT
+    d.Name AS Department,
+    Sel.Name AS Employee,
+    Sel.Salary AS Salary
+FROM
+(
+    SELECT
+        Name,
+        Salary,
+        DepartmentId,
+        DENSE_RANK() OVER (PARTITION BY DepartmentId ORDER BY Salary DESC) AS dr
+    FROM Employee 
+) AS Sel
+INNER JOIN Department d ON d.Id = Sel.DepartmentId
+WHERE Sel.dr = 1

src/main/java/g0101_0200/s0185_department_top_three_salaries/script.sql

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+# Write your MySQL query statement below
+SELECT d.Name AS Department, e.Name AS Employee, e.Salary
+FROM Employee e
+JOIN Department d
+ON e.DepartmentId = d.Id
+WHERE e.Salary IN (
+    SELECT e2.Salary FROM (
+        SELECT DISTINCT e3.Salary FROM Employee e3
+        WHERE e3.DepartmentID = d.Id
+        ORDER BY e3.Salary DESC
+        LIMIT 3
+    ) AS e2
+);