The file_fdw module provides the foreign-data wrapper file_fdw, which can be used to access data files in the server's

This chapter provides an overview of how to use SQL to perform simple operations. This tutorial is only intended to give you an introduction

The pg_freespacemap module provides a means for examining the free space map (FSM). It provides a function called pg_freespace

The catalog pg_am stores information about relation access methods. There is one row for each access method supported by the system. Currently

The planner classifies operations involved in a query as either parallel safe, parallel restricted, or parallel

In addition to the system catalogs, PostgreSQL provides a number of built-in views. Some system views provide convenient access to some commonly

The catalog pg_amop stores information about operators associated with access method operator families. There is one row for each operator that

The catalog pg_pltemplate stores "template" information for procedural languages. A template for a language allows

A window function performs a calculation across a set of table rows that are somehow related to the current row. This is comparable to the type of

NameCREATE RULE -- define a new rewrite rule Synopsis