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在 mySQL 中，我想做的是查询我的表并找出每天有多少人注册。换句话说，我希望能够在一个月内产生以下输出：

1 January: 10 registrations
2 January: 150 registrations
3 January: 50  registrations

select created, regID
from registrations

数据库中的日期格式如下：2012-11-01 00:00:00

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4 回答 4

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要获取 1 月每一天的注册计数，请使用以下命令select：

select daymonth(registration_date), count(*)
from registrations
where registration_date >= '01/01/2012' and registration_date <= '01/31/2012'
group by daymonth(registration_date)
于 2012-11-01T16:27:58.077 回答
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您通常使用分组运算符：

SELECT COUNT(*) AS registrations, DATE(created) AS created_date GROUP BY created_date

如果created已经是一DATE列，则不需要转换。

于 2012-11-01T16:27:27.553 回答
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试试这个：

SELECT created, count(regID) FROM registrations GROUP BY created ORDER BY created ASC
于 2012-11-01T16:27:28.247 回答
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SELECT   DATE(DATE_REGISTERED) DATE, COUNT(*) totalRegistered
FROM     tableName
GROUP BY DATE
于 2012-11-01T16:28:24.907 回答