How to select a number of logins by a MySQL query? - mysql

Question

I would like to select all login events and also the number of logins under one specific IP address by a MySQL query.
The Query that I have come up with is as follows. But I am afraid I have been missing something.
Hopefully one can see my mistake.
SELECT `pp_loginevent`.`loginevent_user`,
`pp_loginevent`.`loginevent_creationdate`,
`pp_loginevent`.`loginevent_ip`,
`pp_user`.`user_id`,
`pp_user`.`user_name`,
`pp_user`.`user_rights`,
`pp_user`.`user_active`,
`pp_license`.`license_name`
(SELECT COUNT(1)
FROM `pp_loginevent`
WHERE `loginevent_ip` = `pp_loginevent`.`loginevent_ip`
) AS `pp_loginevent`.`number_of_logins`
FROM `pp_loginevent`
LEFT JOIN `pp_user`
ON `pp_loginevent`.`loginevent_user` = `pp_user`.`user_id
LEFT JOIN `pp_license`
ON `pp_loginevent`.`loginevent_license` = `pp_license`.`license_id`
WHERE `loginevent_creationdate` LIKE '2019-%'
AND `user_rights` <= '6'
GROUP BY `loginevent_ip`
ORDER BY `loginevent_creationdate` DESC
What I am trying to do is to fetch the "column" number_of_logins and that should contain the number of logins made from a specific IP address.

Answer 1

You can't see anything wrong here:
`pp_license`.`license_name`
(SELECT COUNT(1) FROM `pp_loginevent` WHERE `loginevent_ip` = `pp_loginevent`.`loginevent_ip`) AS `pp_loginevent`.`number_of_logins`
?
While this won't resolve all the problems with this query, I think writing the query out this way makes one error very obvious:
SELECT e.loginevent_user
, e.loginevent_creationdate
, e.loginevent_ip
, u.user_id
, u.user_name
, u.user_rights
, u.user_active
, l.license_name
(SELECT COUNT(1)
FROM pp_loginevent
WHERE loginevent_ip = pp_loginevent.loginevent_ip) pp_loginevent.number_of_logins
FROM pp_loginevent e
JOIN pp_user u
ON u.user_id = e.loginevent_user
LEFT
JOIN pp_license l
ON l.license_id = e.loginevent_license
WHERE e.loginevent_creationdate >= '2019-01-01'
AND e.loginevent_creationdate < '2020-01-01'
AND user_rights <= 6
GROUP
BY loginevent_ip
ORDER
BY loginevent_creationdate DESC
In truth, as well as this syntax error, I suspect that there are other, logical, errors in this query.
Accordingly, see: Why should I provide an MCRE for what seems to me to be a very simple SQL query?