Relational databases are the workhorses of the modern database industry. They have limitations, however, when it comes to handling some types of data, in particular the large quantities of free-form data generated through mobile technology. NoSQL databases provide solutions for some of these problems but they introduce another problem in having no single query language that drives them.
This paper examines the problem, surveys the solutions, and answers the question of how to implement the solutions through a consistent API.
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