Postgres and Open Source Experts

In PostgreSQL, the INNER JOIN is used to get the matching results from two or more tables based on a specific join condition.

In PostgreSQL, built-in functions like pg_relation_size(), pg_database_size(), pg_size_pretty(), etc. are used to get the size of the table or database.

In Postgres, the VERSION(), CURRENT_DATABASE(), CURRENT_SCHEMA, and CURRENT_USER, functions are used to get the current version, database, schema, and user.

To reset a forgotten password for a “postgres” user > open the “pg_hba.config” file located at “C:\Program Files\PostgreSQL\15\data”, and replace the local connections with “trust”.

Execute the “GRANT ALL PRIVILEGES” command to grant all the database privileges to the user, such as creating a database, dropping a database, etc.

PostgreSQL allows us to update an already existing array using the “UPDATE SET” statement. Specify the array index with the array name to update only a specific element of an array.

To uninstall Postgres from windows, open control panel > go to programs and features > locate PostgreSQL > Uninstall the PostgreSQL.

In PostgreSQL, the “-” operator is used to subtract minutes from the current or specific DateTime values. Where the DateTime value can be a date, interval, time, or timestamp.

RPAD() or “right padding” is a built-in function in Postgres which fills a string of a specific length with a substring. It fills/pads the given string from the right side.

In PostgreSQL, the minus operator “-”, the EXTRACT(), and the AGE() functions are used to find the difference between the given timestamps.