RETURN with an expression terminates the function and returns the value of expression to the caller. This form is used for PL/pgSQL functions that do not return a set. In a function that returns a ...

PL/pgSQL can be used to define trigger procedures. A trigger procedure is created with the CREATE FUNCTION command, declaring it as a function with no arguments and a return type of trigger. Note that ...

This module implements the hstore data type for storing sets of key/value pairs within a single PostgreSQL value. This can be useful in various scenarios, such as rows with many attributes that are ...

pg_restore — restore a PostgreSQL database from an archive file created by pg_dump Restore only the data, not the schema (data definitions). Table data, large objects, and sequence values are restored ...

The PoWA team is pleased to announce the release of the version 2.3.0 ofpg_stat_kcache, an extension that gathers statistics about real reads and writes done by the ...

Continuous archiving can be used to create a high availability (HA) cluster configuration with one or more standby servers ready to take over operations if the primary server fails. This capability is ...

Value expressions are used in a variety of contexts, such as in the target list of the SELECT command, as new column values in INSERT or UPDATE, or in search conditions in a number of commands. The ...

CREATE INDEX constructs an index on the specified column(s) of the specified table. Indexes are primarily used to enhance database performance (though inappropriate use can result in slower ...

As explained previously, the expression in such a statement is evaluated by means of an SQL SELECT command sent to the main database engine. The expression must yield a single value (possibly a row ...

CREATE TABLE will create a new, initially empty table in the current database. The table will be owned by the user issuing the command. If a schema name is given (for example, CREATE TABLE ...

If you have pattern matching needs that go beyond this, consider writing a user-defined function in Perl or Tcl. While most regular-expression searches can be executed very quickly, regular ...