[SQL] use correlated subquery to find all employees whose salary is above average for their department

Data Science Interview Questions › Category: Data Science › [SQL] use correlated subquery to find all employees whose salary is above average for their department
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MockInterview Staff asked 3 years ago
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2 Answers
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MockInterview Staff answered 3 years ago 
SELECT employee_number, name
   FROM employees emp
   WHERE salary > (
     SELECT AVG(salary)
       FROM employees
       WHERE department = emp.department);

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MockInterview Staff answered 3 years ago

Without correlated subquery: https://en.wikipedia.org/wiki/Correlated_subquery

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