mysql 如何统计一个字段不同值条数？

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写了个DEMO,在线预览

先说下我用的时间格式是date,年-月-日这种形式

统计次数,count再group by 列名

SELECT `periods`,DATE_FORMAT(time,'%Y-%m') as month,COUNT(*) AS `times` FROM `product` GROUP BY `periods`,`month` ORDER BY `month` DESC

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DOC:
date_format:http://www.w3school.com.cn/sql/func_date_format.asp
group by:http://www.w3school.com.cn/sql/sql_groupby.asp

用count函数

用两个group by 条件就可以了呀

select count(id), periods, from_unixtime(time, '%Y-%m')
from product
where  你的条件
group by periods,from_unixtime(time, '%Y-%m')

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呃，大概思路是这个样子的

select periods,sum(periods) as count from product where month>='时间' and mouth