MySQL:每天的总和

Question

我有一张桌子如下:

datetime (datetime)  count (int)
2012-12-27 09:22:15    5
2012-12-27 18:20:15    4
2012-12-27 23:19:15    3
2012-12-26 13:45:15    8
2012-12-26 04:56:15    7
2012-12-25 01:50:15    2
2012-12-25 12:02:15    1

在MySQL中,如何查询是否希望每天返回总和(计数)和结果,如下所示:

2012-12-27    12
2012-12-26    15
2012-12-25    3

Answer 1

你需要使用DATEcolumnName周围的函数DateTime.

SELECT    DATE(datetime) as DATE, SUM(`count`) totalCOunt
FROM      tableName
GROUP BY  DATE(datetime)

• SQLFiddle演示