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• Is it possible to extend Is it possible to extend features and data types in postgresql?

  Yes it is, we can extend PostgreSQL in terms of data types and in terms of functions.

  See the The concept of extensibility section for more details.

• Does PostgreSQL support only relational databases?

  No, PostgreSQL supports NoSQL databases too.

  See the The NoSql data type section for more details.

• Does PostgreSQL support SQL functions?

  Yes it does, we can write any kind of SQL function.

  See the SQL functions section for more details.

• Does PostgreSQL have a default built-in procedural language ?

  Yes PostgreSQL has a default built-in procedural language called PL/pgSQL.

  See the PL/pgSQL functions section for more details.

• As a user without administrative privileges, can we read a table that requires administrative permissions in order to be read...