Postgres and Open Source Experts

In PostgreSQL, a table column created with a NOT NULL constraint accepts only non-null values. It can be added when creating a new or altering an existing table.

In PostgreSQL, the ALTER DATABASE command is used with the collaboration of the OWNER TO clause to change the database owner.

Postgres is becoming increasingly popular every day due to its stunning features. This post explained how to download, install, and use Postgres on macOS.

To install PostgreSQL on your Ubuntu operating system, run the “sudo apt install postgresql postgresql -contrib” command.

psycopg is a Postgres Python connector that allows Python programs to access Postgres databases. It is used to perform various operations on Postgres database via python.

In PostgreSQL, the “ILIKE” operator is used to fetch/query the data based on pattern matching. The ILIKE operator queries the data case-insensitively.

In Postgres, the DROP USER statement is used to drop a single user or multiple users simultaneously. Use IF EXISTS option to check the existence of a user.

Use the ALTER USER or ALTER ROLE statement to change/modify the password of a Postgres user. You can use the VALID UNTIL clause to specify the password’s expiry date and time.

Use the ADD CONSTRAINT or DROP CONSTRAINT clause with the ALTER TABLE command to add or drop a primary key constraint from a Postgres table.

Postgres offers a couple of standard tools/utilities, such as pg_dump and pg_dumpall, to back up a single or all databases.