Get authorized user now mysql - mysql

Question

I have table structure:
I need get last authorized user with status 'Signed in' without last status 'Signed off'. How I can do it?
I have a query:
SELECT * FROM vtiger_loginhistory WHERE status = 'Signed in' ORDER BY login_time DESC LIMIT 1
But this get me last authorized user admin, why? If he is Signed off. I need get Igor, because he is Signed in last.

Answer 1

You can try that: first select more recent row for each username and use JOIN or another SELECT to see if it's a "in" or "off"
EDIT: the concept is the same but corrected thanks to this answer
Version i don't fully understand: https://sqltest.net/#464377
SELECT *
FROM vtiger_loginhistory v_l
LEFT JOIN vtiger_loginhistory tmp
ON (v_l.user_name = tmp.user_name AND v_l.login_time < tmp.login_time)
WHERE tmp.login_time IS NULL AND v_l.status = 'Signed in'
ORDER BY v_l.login_time DESC LIMIT 1
Similar result with a subquery as I described (seems slower as explained in linked answer): https://sqltest.net/#464385
SELECT *
FROM vtiger_loginhistory v_l
INNER JOIN (SELECT user_name, MAX(tmp.login_time) AS maxlogintime
FROM vtiger_loginhistory tmp GROUP BY user_name
ORDER BY login_time DESC) tmp2
ON (v_l.login_time = tmp2.maxlogintime)
WHERE status = 'Signed in'
ORDER BY login_time DESC LIMIT 1
EDITED ORIGINAL NOT WORKING VERSION: (because GROUP BY keeps the first row met, so the oldest dates)
SELECT *
FROM (
SELECT *
FROM vtiger_loginhistory
GROUP BY user_name
ORDER BY login_time DESC
) as temp
WHERE status = 'Signed in'
ORDER BY login_time DESC LIMIT 1

Answer 2

You could check for username that is not IN the list for signed off too
SELECT *
FROM vtiger_loginhistory
WHERE status = 'Signed in'
AND username NOT IN (
select username
from vtiger_loginhistory
where status = 'Signed OFF'
)
ORDER BY login_time DESC LIMIT 1

Answer 3

you can try below way by using not exists
select t1.* from vtiger_loginhistory t1
where
status = 'Signed in'
and not exists ( select 1 from vtiger_loginhistory t2
where t2.user_name=t1.user_name
and status = 'Signed off')
order by STR_TO_DATE(login_time,'%Y%m%d %h%i') DESC LIMIT 1
i think your login_time column is not datetime

Answer 4

There are many Signed in and Signed off user, the admin has signed off but the last signed in is more recent than Igor.
There are 2 solutions for you :
Renew the flow, when user Signed off just update the status instead of create new record
Create top1signedoff temporary table first and select the other not in top1signedoff
CREATE TEMPORARY TABLE top1signedoff SELECT username FROM vtiger_loginhistory WHERE status = 'Signed off' ORDER BY login_time DESC LIMIT 1;
SELECT * FROM vtiger_loginhistory
WHERE status = 'Signed in'
and username Not IN (
SELECT username FROM top1signedoff
)
ORDER BY login_time DESC LIMIT 1

Answer 5

Following query should give you the desired result
SELECT t.login_id,t.user_name, t.logout_time,t.login_time,t.status
FROM vtiger_loginhistory t
WHERE t.login_id = (
SELECT MAX(t2.login_id)
FROM vtiger_loginhistory t2
WHERE t2.user_name = t.user_name
GROUP BY t2.user_name
)
AND t.status = 'Signed in';
What we are doing here..
in sub-query we are fetching last login_id for user
and in main query we are checking if the status for that login_id is 'Signed in'