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Technical Interviews

Comprehensive resources to help you prepare for SQL, Python, and data science interviews.

SQL Challenge

SELECT e.employee_name, d.department_name

FROM employees e

JOIN departments d

ON e.department_id = d.id

WHERE d.location = 'New York'

ORDER BY e.salary DESC;

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Master SQL Join Operations

Join operations are the most frequently tested SQL concept in interviews. Our comprehensive guide covers all types of joins with real-world examples.

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Learn SQL Joins
SQL Example
-- Example of INNER JOIN
SELECT e.employee_name, d.department_name
FROM employees e
INNER JOIN departments d
  ON e.department_id = d.department_id
WHERE e.hire_date > '2020-01-01'
ORDER BY e.employee_name;

-- Returns only employees with matching departments

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