如何用短语MySQL查询来获取分组中某列的每日总计？

Question

I have the following table structure:

vote_id     date                    user       source
--------   ------                  ------     --------
1          2013-07-23 01:37:25     user1      x
2          2013-07-23 13:15:10     user2      y
3          2013-07-23 22:30:53     user3      x
4          2013-07-24 17:38:46     user1      y

What I want to get in a query is the number of votes per day for each source. The issue is that I record the date to the second, but I want it sorted by day in the query.

eg The result would be something like this:

2013-07-23    source: x     votes: 10
2013-07-23    source: y     votes: 2

2013-07-24    source: x     votes: 0
2013-07-24    source: y     votes: 6
2013-07-24    source: z     votes: 3

So for every day there will be the total number of votes per source (the number of sources isn't specified, it can be anything).

Any ideas? This query is a bit above me at the moment.

Answer 1

Try something like this:

SELECT 
  DATE(`date`) as day,
  COUNT(user) as votes,
  source
FROM  Tablename
GROUP BY day

Answer 2

Use DATE() function to extract date out of complete datetime field.

Select DATE(date) Day, Source, Count(*) Votes
From Table
Group By DATE(date) Day, Source