The pageinspect module provides functions that allow you to inspect the contents of database pages at a low level, which is useful for debugging

Aggregate functions compute a single result from a set of input values. The built-in normal aggregate functions are listed in Table 9-51 and Table

btree_gin provides sample GIN operator classes that implement B-tree equivalent behavior for the data types int2,

The pg_enum catalog contains entries showing the values and labels for each enum type. The internal representation of a given enum value is

Each index access method is described by a row in the pg_am

The catalog pg_depend records the dependency relationships between database objects. This information allows DROP

NameDROP LANGUAGE -- remove a procedural language Synopsis

NameSHOW -- show the value of a run-time parameter Synopsis

Thus far, our queries have only accessed one table at a time. Queries can access multiple tables at once, or access the same table in such a way that multiple rows of the table

The BRIN interface has a high level of abstraction, requiring the access method implementer only to implement the semantics of the data type