一条SQL语句如何求环比！这个月简历数减去上个月的（如图）
【这个月简历数】-【上个月的简历数】=【环比数】（如图）
sql语句如何写？
SELECT DATE_FORMAT(m_adddate,'%m') as month,count(m_id) as zong,DATE_FORMAT(m_adddate,'%Y') as year from job_myreceive where DATE_FORMAT(m_adddate,'%Y')=2011 GROUP BY DATE_FORMAT(m_adddate,'%m');
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