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Derick Rethans:
MongoDB's aggregation framework
January 22, 2013 @ 09:27:18

Derick Rethans has a new post to his site introducing the aggregation framework that's a part of the MonogDB database system. The aggregation framework gives you functionality to access aggregated values from queries without having to map/reduce.

I wanted to find out which cuisines are used in all of the documents of my dataset. Described in a different way: I want all the different cuisine=... tags as used in my dataset. Traditionally you would write a really complex™ Map/Reduce job, but since MongoDB 2.2, there is a new feature called the aggregation framework. The aggregation framework is meant to be an easy way to do fairly complex aggregation jobs.

He talks about the various keywords and features the framework provides like "$match", "$project" and "$unwind". There's also code snippets included that show both the Mongo command line format and the PHP MongoClient format for making the queries. For those more familiar with writing RDBMS SQL, this functionality might help to replace some of the concepts you've been missing.

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mongodb aggregation framework introduction tutorial


Nick Halstead's Blog:
Three New Programming Tips
December 05, 2007 @ 07:53:00

Nick Halstead has posted a few more of his programming tips in the series he's running - three more to be exact dealing with readable code, aggregation, and code structure tips.

You can check out the full list of his programming tips in this list.

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progamming tips readable aggregation inheritance comment divide progamming tips readable aggregation inheritance comment divide


Derick Rethans' Blog:
New Planet Discovered
January 19, 2006 @ 06:47:47

Derick Rethans has a quick new post today about the "discovery" of a new Planet site focused around the world of eZ Publish.

No, this is not something that New Horizons found as that mission hasn't been launched yet. It's Planet eZ publish, an aggregation of blogs about eZ publish, similar to Planet PHP that aggregates blogs about PHP.

Some of the blogs already included in the list are from people like: Derick himself, Tobias Schlitt, Kristof Coomans, and Paul Borgermans. The RSS feed for the site can be found here...

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planet new ez publish blog aggregation planet new ez publish blog aggregation



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