Postgres and Open Source Experts

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.

PostgreSQL offers a built-in ANY() function that accepts an array as an argument, checks the presence of the given value in the array, and returns a Boolean true or false.

In Postgres, the comma-separated syntax is used in the ORDER BY clause to sort the table’s data based on multiple columns.

To get a month name from a date, specify the date/timestamp as the first and “MONTH” as the second argument to the TO_CHAR() function.