PostgreSQL is very rich in built-in data types and external extensions. It can be extended easily using the C and C++ languages. In fact, PostgreSQL provides an extension-building infrastructure called PGXS so that extensions can be built against an installed server. Some PostgreSQL extensions, such as PostGIS, require complete chapters to discuss.
PostgreSQL provides a very rich set of data types, such as XML, hstore, JSON, array, and so on. These data types can be used to ease the developer's life by not reinventing the wheel and utilizing the very rich set of functions and operators. Also, several PostgreSQL data types, such as hstore and JSON, can increase the developer's agility because the database's physical design is not amended frequently.
PostgreSQL arrays are very mature; they have a rich set of operators and function. PostgreSQL can handle multidimensional arrays with different base types. Arrays are useful in modeling multivalued attributes as well as in performing several...