MySql select from list the latest connection date for each IP?

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I have a DB that save each login to my server according to the user IP

2018-08-07 00:00:00, 10.1.1.1

2018-08-06 07:00:00, 10.1.1.1

2018-08-05 00:22:00, 10.1.1.1

2018-08-07 00:00:00, 10.1.1.5

2018-08-05 00:00:00, 10.1.1.5

and so on.....

I want to know when was the latest connection according to each IP so in the end I see :

2018-08-07 00:00:00, 10.1.1.5

2018-08-07 00:00:00, 10.1.1.1

I have try this :

SELECT IP,Time
FROM sample.connection
WHERE Time in (SELECT MAX(Time) from sample.connection GROUP BY IP);

but it doesn't work - I don't see the latest connection for all the IP (only some of them)

my IP is varcahr(45)

Time is Datetime

what is wrong ?

Try below query, you need a subquery and join:

SELECT sc.IP,sc.Time
FROM sample.connection sc
INNER JOIN
    (SELECT IP, MAX(Time) AS lstTime 
     FROM sample.connection 
     GROUP BY IP) t2 ON sc.Time = t2.lstTime AND sc.IP = t2.IP

http://sqlfiddle.com/#!9/8f1e51/2

IP          Time
--------------------------------
10.1.1.1    2018-08-07 00:00:00
10.1.1.5    2018-08-07 00:00:00

Select last record mysql on left join, I have a table that stores all users connections ( date & ip ) and i want to retrieve with a single query all the users data (nickname , avatar ) + the  SELECT d.model, d.date, d.color, d.etc FROM doc d WHERE d.date IN (SELECT max(d2.date) FROM doc d2 WHERE d2.model=d.model) MySQL 8.0 and newer supports the OVER clause, producing the same results a bit faster for larger data sets.

http://sqlfiddle.com/#!9/8f1e51/1

SELECT sc.IP, sc.Time
FROM sample.connection sc
LEFT JOIN sample.connection t
ON sc.ip = t.ip
   AND sc.time<t.time
WHERE t.ip IS NULL;

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I must be missing something. Why isn't this a simple SELECT with MAX and GROUP BY?

SELECT IP, MAX(Time) as Time FROM conn GROUP BY IP;

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Comments
  • no - this just give the latest connection for all the IP . I want latest for each IP