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

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SELECT e.emp_no AS EMP_NO, e.first_name AS FIRST_NAME, e.last_name AS LAST_NAME, EXTRACT(YEAR FROM sh.change_date) AS CHANGES_YEAR, COUNT(*) AS CHANGES_COUNT FROM employee e JOIN salary_history sh ON e.emp_no = sh.emp_no GROUP BY e.emp_no, e.first_name, e.last_name, EXTRACT(YEAR FROM sh.change_date) HAVING COUNT(*) > 1 ORDER BY e.emp_no; ; SELECT 'Last_query_cost' AS "Variable_name", 0 AS "Value" FROM RDB$DATABASE;

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