Hi,
You could use a cross join.
You basically have one table
select
userType
, count(1)
from
some_table
group by
userType
and a second one
select count(1) from some_table
With a cross join you can add the global count to every results in the
first table and compute a ratio.
Regards
Bertrand
On Fri, Sep 7, 2012 at 7:23 AM, MiaoMiao <liy...@gmail.com> wrote:
> I have a table, containing userId and userType.
> userId userType
> 1 A
> 2 B
> 3 C
> 4 A
> 5 B
> 6 B
>
> I want to get percentage of each userType.
> My current solution:
> 1. Get count of each group via THRIFT
> select
> userType
> , count(1)
> from
> some_table
> group by
> userType
>
> 2. Calculate each userType using other programming language like PHP.
>
> This solution is fine, but I'm just curious, is there a way to do it
> in one query?
> I know this query works in mysql, but not hive.
> select
> userType
> , count(1)/(select count(1) from some_table)
> from
> some_table
> group by
> userType
>
--
Bertrand Dechoux
