My Current MySQL query:
我当前的MySQL查询:
SELECT MAX( s.con_grade ) AS max, YEAR( u.sent_date ) AS year
FROM pdb_usersectionmap u
LEFT JOIN pdb_sections s ON u.section_id = s.id
WHERE u.user_id =21
AND YEAR( u.sent_date ) > '2004-01-01'
GROUP BY YEAR( u.sent_date )
ORDER BY u.sent_date ASC
SELECT
