Other way to write query I'm new to sql language and I'm learning about subqueries..
I have one question is there other way how to write that query?

SELECT Employees.FirstName, 
       Employees.LastName 
FROM   Employees 
WHERE  Employees.HireDate &lt; (SELECT MIN(Employees.HireDate) 
                             FROM   Employees 
                             WHERE  Employees.City = 'London');


on northwind database schema


Thank you,
I really appreaciate your answer
I won't post the final answer to your homework exercise but you should become familiar with the SELECT TOP(1) ... ORDER BY construct. For example, the query below could be used to get the birth date of the oldest employee. 

SELECT TOP(1) BirthDate
FROM Employees
WHERE BirthDate IS NOT NULL
ORDER BY BirthDate