Postgres and Open Source Experts

To install PostgreSQL using Docker Compose, specify the desired services in compose file. Then, start the compose service to build and run Postgres container.

In PostgreSQL, the “CURRENT_USER”, “CURRENT_ROLE”, and “USER” methods are used to get the details of the current user.

In PostgreSQL, SETVAL() is one of the sequence functions that resets the current value of the selected sequence and retrieves the specified value.

To create a PostgreSQL database in Docker, use the “CREATE DATABASE <database-name>;” command. Then, create a new table in it and insert values in the table.

In PostgreSQL, the “information_schema”, “pg_catalog”, and “pg_tables” are used to check the existence of a specific table in the current database.

In PostgreSQL, several methods are used to check/find the hostnames and port numbers, such as the “\conninfo” command, the “pg_settings” view, etc.

To get the list of all stored procedures in a database, the “\df” command, “pg_proc” catalog, and “information_schema.routines” view are used in Postgres.

In PostgreSQL, a user-defined function can be created that accepts the table name and schema name as arguments.

In PostgreSQL, the “\dx” command, “pg_extension” catalog, and “pgAdmin” are used to get the list of installed extensions.

To update multiple columns of a PostgreSQL table, use the comma-separated syntax within the UPDATE statement, combined with the SET clause.