An important distinction to make at this point is that views are not queries, but means of querying for documents. You'll run queries against the view index in order to find the original documents. It is a common misconception that the views you write are actual queries.
Couchbase views have an API that supports a variety of search options, from an exact key search to a key range search. Continuing to use the Couchbase Console, we'll explore the various parameters we are able to use as we query our views. Begin by clicking on the down arrow next to the Filter Results text above the results panel.
Filtering views
To continue with the reduce example, check the box next to group and click on Close. Click on Show Results again, and you'll now see that the results are grouped by the name of the category, as shown here:
There's an additional parameter called group_level under the group option. This parameter takes an integer argument and is meant to be used with composite (array...