Free Online Firebird 4.0 (Employee) Playground: Practice & Master SQL Skills

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SELECT emp_no AS EMP_NO, first_name AS FIRST_NAME, last_name AS LAST_NAME, EXTRACT(YEAR FROM change_date) AS CHANGES_YEAR, COUNT(*) AS CHANGES_COUNT FROM ( SELECT e.emp_no, e.first_name, e.last_name, sc.change_date FROM employee e JOIN salary_changes sc ON e.emp_no = sc.emp_no -- Adjust based on your actual schema ) employee_changes GROUP BY emp_no, first_name, last_name, EXTRACT(YEAR FROM change_date) HAVING COUNT(*) > 1 ORDER BY emp_no; ; SELECT 'Last_query_cost' AS "Variable_name", 0 AS "Value" FROM RDB$DATABASE;

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