从表中计算出现

Question

这是我的表...我需要计算每个日期最后一列的实例。

所以基本上必须

date      Count 
2015-02-02    8 
2015-02-03    10 


2015-02-02 01:30:00 PM    1 
2015-02-02 02:30:00 PM    1 
2015-02-02 03:30:00 PM    1 
2015-02-02 05:30:00 PM    1 
2015-02-02 06:30:00 PM    1 
2015-02-02 08:30:00 AM    1 
2015-02-02 09:30:00 AM    1 
2015-02-02 11:30:00 AM    1 
2015-02-03 01:30:00 PM    2 
2015-02-03 02:30:00 PM    2 
2015-02-03 03:30:00 PM    2 
2015-02-03 04:30:00 PM    2 
2015-02-03 05:30:00 PM    2 
2015-02-03 06:30:00 PM    2 
2015-02-03 08:30:00 AM    2 
2015-02-03 09:30:00 AM    2 
2015-02-03 10:30:00 AM    2 
2015-02-03 11:30:00 AM om   2 
2015-02-04 01:30:00 PM    3 
2015-02-04 02:30:00 PM    3 
2015-02-04 03:30:00 PM    3 
2015-02-04 05:30:00 PM    3 
2015-02-04 06:30:00 PM    3 
2015-02-04 08:30:00 AM    3 
2015-02-04 09:30:00 AM    3 
2015-02-04 10:30:00 AM    3 
2015-02-04 11:30:00 AM    3 
2015-02-05 01:30:00 PM    4 
2015-02-05 02:30:00 PM    4 
2015-02-05 03:30:00 PM    4 
2015-02-05 04:30:00 PM    4 
2015-02-05 05:30:00 PM    4 
2015-02-05 06:30:00 PM    4 
2015-02-05 08:30:00 AM    4 
2015-02-05 09:30:00 AM    4 
2015-02-05 10:30:00 AM    4 
2015-02-05 11:30:00 AM    4 
2015-02-06 01:30:00 PM    5 
2015-02-06 02:30:00 PM    5 
2015-02-06 08:30:00 AM    5 
2015-02-06 09:30:00 AM    5 
2015-02-06 10:30:00 AM    5 
2015-02-06 11:30:00 AM    5 

Answer 1

select DATE(datecolumn) as thedate, count(lastcol) from sometable group by thedate

类似的问题：https://stackoverflow.com/a/366610/636077