SQL select 过去 24 小时内的热门标签

Question

This is my query

SELECT *
FROM posts
WHERE description like concat('%', :hashtag, '%')
ORDER BY STR_TO_DATE(time,'%d-%m-%Y %H:%i:%s') ASC

I would like to select from posts the top hashtags only in the time last 24 hours

PHP TIME FORMAT STR_TO_DATE(time,'%d-%m-%Y %H:%i:%s')

EXAMPLE

SELECT * FROM posts WHERE time >= NOW() - INTERVAL 1 DAY GROUP BY description HAVING like concat('%', :hashtag, '%')

Answer 1

To get amount of posts with one hashtag you need a GROUP BY to be able to COUNT them. On the other hand sorting it by time makes no sense at all.

It would look like this:

SELECT COUNT(*) as hashtag_count,hashtag FROM posts WHERE time >= NOW() - INTERVAL 1 DAY GROUP BY hashtag ORDER BY hashtag_count

Answer 2

You can add a LIMIT x do the query.

To ensure that all "hashtags" are set within the specific date, you can add +,- day onto the date as well.

As for the top results, is there something like a score that is given to them?