MYSQL

Question

我有一个 table 列

id    date   title

我想获取每个标题每个日期的总出现次数列表。例如得到：

date       title       total
20 Apr  - My Title A  - 3
20 Apr  - My Title B  - 2
21 Apr  - My Title A  - 5
22 Apr  - My Title B  - 1
22 Apr  - My Title C  - 1
23 Apr  - My Title A  - 6
23 Apr  - My Title B  - 2
23 Apr  - My Title C  - 5
24 Apr  - My Title C  - 2
24 Apr  - My Title D  - 2

但我只想获取具有最多值的记录，因此根据上面的示例，总出现次数为：

如果我只想要前 2 个，那么我期望的是第一个列表，但只过滤热门标题：

20 Apr  - My Title A  - 3
21 Apr  - My Title A  - 5
22 Apr  - My Title C  - 1
23 Apr  - My Title A  - 6
23 Apr  - My Title C  - 5
24 Apr  - My Title C  - 2

我的第一种方法是执行一个子查询，按标题对顶部进行计数，然后过滤标题在计数最多的列表中的位置。但是我想知道有没有更简单的方法。

Answer 1

我的初始答案将与问题中提出的解决方案相同：

Select DATE(date) as date, top.title, count(*) as total  from (
    Select  title, count(*) as total 
    from List
    where date > (current_date - interval 30 day)
    group by title 
    order by total
    desc limit 5) top
 left join List on top.title = List.title 
 where List.date > (current_date - interval 30 day)
 group by DATE(List.date), top.title
 order by date asc

MYSQL - 获取按值和日期分组的 TOP 5 内容

MYSQL - Get TOP 5 content grouped by value and date

select

group-by

count

having