Postgres and Open Source Experts

Use the DEALLOCATE command followed by the name of the prepared statement to explicitly Deallocate a Prepared Statement in PostgreSQL.

PostgreSQL provides a system view named pg_stat_activity that retrieves information about the currently running queries and active sessions on the database server.

In PostgreSQL, the PREPARE statement creates a prepared statement that can be utilized repeatedly. It allows us to execute the command with different values.

To install the Docker PostgreSQL environment, install Docker on the system from the official link. After that, pull the Postgres image from Docker Hub using the “docker pull postgres”.

To delete data from PostgreSQL tables using Python, execute the delete query with the help of the “execute()” function.

To call/invoke a user-defined function in PostgreSQL, Positional Notation, Named Notation, or Mixed Notation can be used.

To create a repeating sequence in Postgres, the CREATE SEQUENCE command can be executed with the “CYCLE” option enabled.

In PostgreSQL, the "BIGINT" data type is used to store extremely large positive or negative numbers and can serve as an alternative to Java’s Long data type.

In PostgreSQL, the “\df” mata-command, “information_schema.routines” View, and the “pg_proc” Catalog is used to get the list of user-defined functions.

The CREATE FUNCTION statement allows us to create a user-defined function by specifying its name, parameters, return type, and the language to be implemented.