PostgreSQL
PostgreSQL is an interesting choice in this section because, technically, there is no separate NoSQL version of PostgreSQL, but rather PostgreSQL has added various features in recent releases that have added NoSQL capabilities to the existing Postgres implementation.
Proponents of PostgreSQL rightly point out that it is a much older, and, by extension tested technology, having been first released in the mid-1990s. Postgres now supports hierarchical document data storage, JSON, a key-value store (called HStore), and sharding, and includes interfaces for various programming languages as well as diverse data sources. In other words, PostgreSQL has been extended to support NoSQL-like functionalities while maintaining its existing capabilities ...
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