Silly me, assuming that the subtraction operator would do the right thing. Er, any idea what the subtraction operator _does_ do?
On 3 August 2015 at 05:33, Huji Lee <[email protected]> wrote: > You are seeing those gaps because the method you use to calculate account > age is not correct. Run this query: > > select user_id, user_registration, > (now() - str_to_date(user_registration, '%Y%m%d%H%i%s'))/86400 as > registered_time > from user > where user_id >= 25650026 > and user_id <= 25650027; > > And you will see that those two accounts which are created back to back, > one at the end of 6/30/2015 and one at the beginning of 7/1/2015 will > return an account age of ~2000 and ~1181 respectively (two numbers that are > not that close). > > Instead, run this: > > select user_id, user_registration, > datediff(now(), str_to_date(user_registration, '%Y%m%d%H%i%s')) as acct_age > from user > where user_id >= 25650026 > and user_id <= 25650027; > > And you will get the account age in days (33 and 34 days in this example). > > > On Sun, Aug 2, 2015 at 1:12 PM, Golden Ring <[email protected]> > wrote: > >> I'm hoping that someone here can explain some query weirdness to me. >> >> I'm trying to get a list of the n most-recently-registered users who have >> done page moves, and how many page moves they've done. To do this, I'm >> using this query: >> >> select >> user_id, >> user_name, >> (now() - str_to_date(user_registration, '%Y%m%d%H%i%s'))/86400 as >> registered_time, >> count(log_id) as moves >> from >> user, >> logging_userindex >> where >> user_id = log_user >> and (log_action = 'move' or log_action = 'move_redir') >> group by user_id >> order by user_id desc >> limit {}; >> >> For a limit of about 100 rows, this gives plausible-looking results. But >> increasing the limit to 1000 gives some pretty bizarre results. There are >> big gaps in the registered_time variable. The range of the registered_time >> variable is about 0 - 4,000 days, but there are no results with registered >> times between approx 350 - 1160 days, 1500 - 2300 days, or 2670 to 3480 >> days. >> >> July 2013 is about 700 days ago, but a query to find users with page >> moves who registered on July 15, 2013 shows that such users do exist: >> >> select count(*) from user, logging_userindex where user_id = log_user and >> log_action='move' and user_registration like '20130715%'; >> >> Result: 63 move actions from users registered on 20130715. >> >> What's going on here? I assume I've simply got the first query wrong in >> some way, but I can't see how. >> >> Note that all of the above is against the enwiki replica. >> >> Thanks for any help, >> GoldenRing >> >> >> _______________________________________________ >> Labs-l mailing list >> [email protected] >> https://lists.wikimedia.org/mailman/listinfo/labs-l >> >> > > _______________________________________________ > Labs-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/labs-l > >
_______________________________________________ Labs-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/labs-l
