CREATE TABLE management (department_id NUMBER, head_id NUMBER, temporary_acting CLOB)
CREATE TABLE head (head_id NUMBER, name CLOB, born_state CLOB, age NUMBER)
CREATE TABLE department (department_id NUMBER, name CLOB, creation CLOB, ranking NUMBER, budget_in_billions NUMBER, num_employees NUMBER)

In which year were most departments established?
SELECT creation FROM department GROUP BY creation ORDER BY COUNT(*) DESC LIMIT 1
SELECT "creation" FROM "department" GROUP BY "creation" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY