November 2015
Beginner to intermediate
248 pages
5h 24m
English
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Built-in reduce functions
Often, we want to perform summarized/aggregate operations on data, such as count or grouping of documents by some attributes and using it to report or get statistics about some documents. This kind of grouping of data or documents takes place in the reduce function of the view. For example, we want to find the total number of users in our LearningCouchbase bucket, the total number of skill sets by the user, and so on. The reduce() function will reduce an array of values emitted by the corresponding map() function. Couchbase ensures that the reduce function is applied to each record of the input parameter, and the returned value is the result of the view. The output of the reduction is stored along with the view information. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.