Postgres and Open Source Experts

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.

In PostgreSQL, the ALTER TABLE statement is executed with the “ADD GENERATED AS IDENTITY” option to add an IDENTITY column to a pre-existing table.

In PostgreSQL, the “lastval of the sequence is not yet defined” error occurs when the LASTVAL() function is invoked/called prior to the NEXTVAL() function.