mysql 获取规定时间段内的统计数据
按年统计
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SELECT
count(*),
DATE_FORMAT(order_info.create_time, '%Y-%m-%d') AS count_by_date
FROM
order_info
WHERE
DATE_FORMAT(order_info.create_time, '%Y') = '2017'
GROUP BY
count_by_date
ORDER BY NULL
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按月统计
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SELECT
count(*),
DATE_FORMAT(order_info.create_time, '%Y-%m-%d') AS count_by_date
FROM
order_info
WHERE
DATE_FORMAT(order_info.create_time, '%Y-%m') = '2017-04'
GROUP BY
count_by_date
ORDER BY NULL
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具体变换可以自己根据需求变更
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原文链接：http://blog.csdn.net/smile_miracle/article/details/69961185