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SQL Challenge: Employee Salary Analytics

Consider an employees table:

  • employee_id (int)
  • employee_name (varchar)
  • department (varchar)
  • joining_date (date)
  • salary (decimal)
  1. Highest Earner by Department:
  2. Find the employee with the highest salary in each department.
  3. Average Salary by Department and Year:
  4. Calculate the average salary for each department per year.
  5. Longest Serving Employee:
  6. Identify the employee with the longest tenure.

Please provide concise SQL queries for these analyses, emphasizing simplicity and efficiency. Thanks!

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