Re: How to create view to count number of unique values from documents .... ?

[Chris Van Pelt <va...@gmail.com>]

The documented example is the way to do it.  It's really slow to
generate the view the first time, but as you add documents it will
only need to regenerate the index for those new documents.

Chris

On Thu, Jan 15, 2009 at 2:56 AM, Viacheslav Seledkin
<vi...@avicomp.com> wrote:
> After reading all docs I think it is not trivial. The task itself: I have
> documents with fields
> ..............
> doc(N) = {
> ...
> tag:"y",
> tag:"o",
> tag:"b",
> tag:"b",
> tag:"v",
> tag:"r",
> ............
> }
>
> doc(N+1) = {
> ...
> tag:"a",
> tag:"b",
> tag:"t",
> tag:"b",
> tag:"u",
> tag:"r",
> ...
> }
>
> doc(N+2)= {
> ...
> tag:"t",
> tag:"m",
> tag:"i",
> tag:"b",
> tag:"l",
> tag:"z",
> ...........
> }
> .............
> and so on...
>
> How to create a view that allows to get number of unique tags throught
> various range of some keys.
> i.e
> ..
> emit(keyN1,"y") - from document doc(N)
> emit(keyN2,"o") - from document doc(N)
> ....
> emit(key(N+2),"z") - from document doc(N+2)
> ..
>
> and view request
> http://.../_view/?startkey=someStartKey&endkey=someEndKey
> gives me something like
>
> {"rows":[{"key":null,"value":12}]}????
>
> Of course i can use documented example with emit("y",1) and  reduce()(return
> sum(values);) and count the number of rows returned to the client but i have
> many thousands of tags and it is not effective. Any help appreciated.
>
>