mysql根据日，周，月分组统计
根据日统计：selectyear(create_datetime),month(create_datetime),day(create_datetime),count(*) from redpacket group by year(create_datetime),month(create_datetime), day(create_datetime); 根据周统计：
select FROM_DAYS(TO_DAYS(create_datetime) -MOD(TO_DAYS(create_datetime) -2, 7)) AS week from redpacket group by week; 根据月统计：
select count(*) from redpacket group by year(create_datetime),month(create_datetime);
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