Question

我在 mysql 数据库中有一个示例表，如下所示：

id       dateAdded
----------------------------
1        2013-12-24 03:03:19
2        2013-12-24 03:04:19
3        2013-12-24 03:06:14
4        2013-12-24 03:07:23
5        2013-12-25 03:04:19
6        2013-12-26 03:02:19
7        2013-12-26 03:03:19

我想COUNT ids有多少date具有相同的date Count ----------------------- 2013-12-24 4 2013-12-25 1 2013-12-26 2，因此结果将是：

{{1}}

请你帮我解决 Mysql 查询

Answer 1

简单地按DATE分组（dateAdded）应该可以正常工作;

SELECT DATE(dateAdded) date, COUNT(*) Count
FROM sample_table
GROUP BY date
ORDER BY date

An SQLfiddle to test with

Answer 2

您必须先使用date()或date_format()将其设置为YYYY-MM-DD格式，然后再将其分组：

SELECT
    count(*)
    ,date_format(dateAdded, '%Y-%m-%d') as dateAdded1
    // ,date(dateAdded) as dateAdded2
FROM
    TABLENAME
GROU BY
    dateAdded1 desc

Answer 3

SELECT DATE_FORMAT(`dateAdded`, '%Y-%m-%d') AS date, COUNT(*) AS count
FROM table
GROUP BY date

Group BY Date计算的数量

3 个答案: