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NoSQL database systems are designed for scalability. The down side of that is a primitive key-value data model and, as the name suggest, no support for SQL. It might sound like a serious limitation – how can I “select”, “join”, “group” and “sort” the data? This post explains how all these operations can be quite naturally and efficiently implemented in one of the most famous NoSQL system – Cassand
Further reading: for an in-depth introduction see Understanding the Cassandra Data Model at datastax.com For newcomers Cassandra data model is a mess. Even experienced database developers spend quite a bit of time learning it. There are great articles on the Web that explain the model. Read WTF is a SuperColumn? An Intro to the Cassandra Data Model and my favorite one – Installing and using Apache
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