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On 07/30/2011 10:45 AM, Alexey Pechnikov wrote:
> Very interesting annonce:
> http://www.couchbase.com/press-releases/unql-query-language

It is rather difficult to work out from the spec pages how it differs from
regular SQL.  Personally I think it is a pointless exercise.  The MongoDB
query language is a far better fit for JSON data because the queries are
expressed as JSON.  It also deals well with the nested structure of JSON
documents, that items can be lists etc.  This page shows some example
queries and then shows how operators are implmented:

  http://www.mongodb.org/display/DOCS/Advanced+Queries

BTW if anyone is interested I have a virtual table implementation that lets
you access CouchDB from within SQLite.  The implementation notes section
will be of interest to someone comparing both worlds.

  http://apidoc.apsw.googlecode.com/hg/couchdb.html

Roger

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