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Posted to user@cassandra.apache.org by Donal Zang <za...@ihep.ac.cn> on 2011/04/04 17:45:33 UTC
statistcs query on cassandra
Can we do count like this?
/count <cf>[<startKey>:<endKey>] where <column> = <value>/
--
Donal Zang
Computing Center, IHEP
19B YuquanLu, Shijingshan District,Beijing, 100049
zangds@ihep.ac.cn
86 010 8823 6018
Re: statistcs query on cassandra
Posted by aaron morton <aa...@thelastpickle.com>.
No.
You could build a custom secondary index where "column=value" is the key and startKey and endKey are column names. Then call get_count() with a SlicePredicate that specifies the startKey and endKey as the start and finish column names.
Aaron
On 5 Apr 2011, at 01:45, Donal Zang wrote:
> Can we do count like this?
> count <cf>[<startKey>:<endKey>] where <column> = <value>
> --
> Donal Zang
> Computing Center, IHEP
> 19B YuquanLu, Shijingshan District,Beijing, 100049
> zangds@ihep.ac.cn
> 86 010 8823 6018