Postgres and Open Source Experts

PostgreSQL offers various built-in functions to group data by time, such as the DATE_TRUNC(), EXTRACT(), and DATE_PART() functions.

PostgreSQL has three main logical operators: OR, AND, and NOT. All these operators retrieve a boolean value and are hence also referred to as Boolean operators.

To drop/remove the default value from a column, you need to use the “DROP DEFAULT” keyword with the assistance of the “ALTER TABLE” command.

PostgreSQL provides several integer data types, such as INTEGER, SMALLINT, and BIGINT. These data types assist us in storing and manipulating whole numbers.

In Postgres, the DROP VIEW statement allows us to delete one or more views from a database. To do that, use the DROP VIEW statement followed by the view’s name to be deleted.

In PostgreSQL, the timezone() function converts a timestamp to a different time zone. It retrieves a new timestamp with the same value but in a different time zone.

In PostgreSQL, the built-in DATE() function, CAST operator, and scope resolution operator “::” are used to extract a date from a TIMESTAMP.

PostgreSQL provides an “ALTER DATABASE” command that is used with the “SET TIMEZONE” clause to change the timezone of a Postgres database.

In PostgreSQL, the GREATEST() and LEAST() are built-in functions used to get the biggest and smallest value from the given data, respectively.

Postgres provides various built-in formatting functions such as TO_CHAR(), TO_TIMESTAMP(), etc. that allows us to convert data from one type to another based on some valid format.