MySQL : sum of every day

Question

I have a table as follow:

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

In MySQL, how do I query if I wish to return sum(count) for everyday and result like below:

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

Answer 1

you need to use DATE function around the columnName DateTime.

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

• SQLFiddle Demo

Answer 2

Here you go:

SELECT SUM(`count`) as date_count 
FROM table_name 
GROUP BY date_format( `datetime`, '%Y-%m-%d');

Note: If possible, avoid the usage of Keywords (count) as column names.