Added solutions

Author: adityaramkumar

181.sql

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+# Runtime: 293 ms, faster than 71.46% of MySQL online submissions for Employees Earning More Than Their Managers.
+# Difficulty: Easy
+
+select employee.Name as Employee
+from Employee as employee, Employee as manager
+where employee.ManagerId = manager.Id and employee.Salary > manager.Salary;

183.sql

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+# Runtime: 237 ms, faster than 70.62% of MySQL online submissions for Customers Who Never Order.
+# Difficulty: Easy
+
+select Name as Customers from Customers
+where Id not in (select CustomerId from Orders)