向MySQL COUNT（）添加限制以每天仅考虑最多3行？

Question

I have the following MySQL query:

SELECT (COUNT(id) * 5) AS total FROM content WHERE author = 'newbtophp'

I also have a column called content_timestamp (which contains the UNIX timestamp of when the content was created).

The MySQL query is functioning fine, however I only want the COUNT(id) to consider a maximum of 3 content per day (so if the table content contains more then 3 rows of data WHERE the day (+ month + year) of the content_timestamp is the same then only consider the first 3 and disregard the rest) - this is where I believe the content_timestamp will become useful.

However I'm unsure on how to do this?

All help is greatly appreciated.

Answer 1

Will it work for you?

Update

SELECT 5*SUM(IF(num_content>3,3,num_content)) 
FROM
(
SELECT DATE(content_timestamp) as dt, COUNT(id) as num_content
FROM content     
WHERE author = 'newbtophp'
GROUP BY DATE(content_timestamp)
)a