<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write an SQL query to select the names of all employees whose salary is between 40,000 and 50,000.
<|im_end|>
<|im_start|>assistant
SELECT name FROM employees WHERE salary BETWEEN 40000 AND 50000;<|im_end|>
