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如何指定mySQL的MONTH()函数在此查询中返回'08'而不是8？

我想按日期工作.目前正在获得日期的结果

2006-9
2007-1
2007-10
2007-11

当前查询:

SELECT COUNT(*), CONCAT(YEAR(`datetime_added`), '-', MONTH(`datetime_added`)) as date FROM `person` WHERE (email = '' OR email IS NULL) 
GROUP BY date 
ORDER BY date ASC