December 2013
Intermediate to advanced
208 pages
5h 33m
English
Content preview from Practical Cassandra: A Developer’s ApproachBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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4. CQL
Due to the complex data structures that Cassandra has to offer, it is critical that there be a simple way to manipulate the data you have stored. SQL seemed to be the obvious choice, but there are many things that SQL offers in the way of RDBMSs that Cassandra just cannot yet do.
Enter CQL. Cassandra Query Language (CQL) strives to be as close to SQL as possible. Given that Cassandra is a nonrelational database, a fully featured SQL construct is not possible. The main thing to note about CQL is that it has no concept of GROUP or JOIN, and a very limited implementation of ORDER BY.
This chapter will focus on data creation and manipulation using CQL 3. We will show the parallels of CQL with other features of Cassandra and show the end-result ...
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