This module implements the hstore data type for storing sets of key/value pairs within a single PostgreSQL value

The auto_explain module provides a means for logging execution plans of slow statements automatically, without having to run

The earthdistance module provides two different approaches to calculating great circle distances on the surface of the Earth. The one described

The pg_visibility module provides a means for examining the visibility map (VM) and page-level visibility information. It also provides functions

The pg_trgm module provides functions and operators for determining the similarity of alphanumeric text based on trigram matching, as well as

dict_xsyn (Extended Synonym Dictionary) is an example of an add-on dictionary template for full-text search. This dictionary type replaces words

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

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

The tablefunc module includes various functions that return tables (that is, multiple rows). These functions are useful both in their own right

The fuzzystrmatch module provides several functions to determine similarities and distance between strings.