在长 SQL 查询中的日期之间

Question

I have a query where I get the USER ID and the count of rows from the most common user id in the table 'tickets'. But now, I want to do the same query but it needs to search between 2 datetimes I insert. ( there is an column with a datetime value ('created_at'))

This is the code I have:

SELECT created_by,COUNT(*) as tickets_count
FROM tickets
WHERE created_at
group by created_by having count(*) =(select max(tickets_count) from (select created_by,count(*) as tickets_count from tickets group by created_by) tickets)

This is the table:

I already tried:

SELECT created_by, COUNT(*) as tickets_count
FROM tickets
WHERE created_at BETWEEN '2021-07-25 10:00:00' AND ' 2021-07-30 12:00:00'
group by created_by
having count(*) =(select max(tickets_count) from (select created_by,count(*) as tickets_count from tickets group by created_by) tickets)

But it gave me 0 rows, which isn't true because ID 6 is between those 2 days.

Answer 1

If you are only looking for one user, you can use ORDER BY and LIMIT :

SELECT created_by, COUNT(*) as tickets_count
FROM tickets
WHERE created_at BETWEEN '2021-07-25 10:00:00' AND ' 2021-07-30 12:00:00'
GROUP BY created_by
ORDER BY COUNT(*) DESC
LIMIT 1;

If you want all users when there are duplicates, use window functions:

SELECT t.*
FROM (SELECT created_by, COUNT(*) as tickets_count,
             RANK() OVER (ORDER BY COUNT(*) DESC) as seqnum
      FROM tickets
      WHERE created_at BETWEEN '2021-07-25 10:00:00' AND ' 2021-07-30 12:00:00'
      GROUP BY created_by
     ) t
WHERE seqnum = 1;

Answer 2

试试这个 ：

SELECT created_by,COUNT(*) as tickets_count FROM tickets WHERE date(created_at) BETWEEN date('2021-07-25 10:00:00') AND date(' 2021-07-30 12:00:00') group by created_by having count(*) =(select max(tickets_count) from (select created_by,count(*) as tickets_count from tickets group by created_by) tickets) ```

Answer 3

You can try created_at >= and created_at <=

SELECT created_by ,COUNT(*) as tickets_count 
FROM tickets WHERE created_at >='2021-07-25 10:00:00' and created_at <='2021-07-30 12:00:00' 
group by created_by having count(*) =( select max(tickets_count) 
from (
select created_by,count(*) as tickets_count 
from tickets group by created_by ) tickets ) ;