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From Vijay <>
Subject Re: Help with last 30 day unique user query
Date Fri, 15 Oct 2010 16:43:14 GMT
Thanks, Ning! Finding the date which is 30 days before/later was easy enough
but my problem is beyond that. I need to find unique users based on these
last 30 days for a range of days. Does that make sense?

On Fri, Oct 15, 2010 at 12:10 AM, Ning Zhang <> wrote:

> There are some UDFs that convert a string to epoch time and back to a
> string.  e.g.,
> select from_unixtime(unix_timestamp('2010-10-10', 'yyyy-MM-dd') +
> 60*60*24*30, 'yyyy-MM-dd') from src limit 1;
>  will given you the date which is 30 days later than 2010-10-10.
> On Oct 14, 2010, at 11:36 PM, Vijay wrote:
> > Hi, I need help with this scenario. We have a table of events which has
> columns date, event (not important for this discussion), and user_id. It is
> obviously easy to find number of unique users for each day. I also need to
> find number of unique users in the last 30 days for each day. This is also
> quite simple to do for one day. However, I cannot figure out how to do this
> for a range of days. Something like this is pretty straightforward in most
> RDBMS but with HiveQL has I'm finding this hard. I might be missing
> something simple though. Any help is appreciated. Ideally the query should
> also be as optimized as possible as this table could be huge.
> >
> > Thanks,
> > Vijay
> >

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