The functions and function-like expressions described in this section operate on values of type xml. Check

This feature was designed to allow parameters not normally known to PostgreSQL to be added by add-on modules (such as procedural languages)

When using an external authentication system such as Ident or GSSAPI, the name of the operating system user that initiated the connection might not be the same as the database

Value expressions are used in a variety of contexts, such as in the target list of the SELECT command, as new column values in

PostgreSQL can sometimes exhaust various operating system resource limits, especially when multiple copies of the server are running on the

PostgreSQL is implemented using a simple "process per user" client/server model. In this model there is one

An index column need not be just a column of the underlying table, but can be a function or scalar expression computed from one or more columns of the table. This feature is

NameDROP USER MAPPING -- remove a user mapping for a foreign server Synopsis

The catalog pg_aggregate stores information about aggregate functions. An aggregate function is a function that operates on a set of values

Among all relational operators the most difficult one to process and optimize is the join. The number of possible query plans grows exponentially with