Postgres and Open Source Experts

PostgreSQL provides a built-in mathematical function named LOG() that calculates the logarithm of a number to the base ten or the specified base.

Postgres provides a CEIL() function that takes a numeric value or an expression as an argument and rounds up the given value/expression to the next whole number.

In PostgreSQL, TRUN() function is one of the math functions that accept a numeric value and truncates its entire fractional part or up to specific decimal places.

The “CREATE TEMP TABLE” command is used to create the temporary table in the PostgreSQL. This table will be removed after terminating the current session.

In Postgres, an SQL command: “\dt” and a couple of built-in schemas: pg_catalog and information_schema, are used to list all the tables of a database.

Postgres provides the “ALTER ROLE” statement to alter an existing role with a new role. Using this, users can change the name and attributes of any existing role.

In PostgreSQL, users can access and override the privileges/rights of the database objects through the “GRANT” statement.

In PostgreSQL, the “REVOKE” statement is quite helpful in revoking the granted privileges from single or multiple roles.

In Postgres, the DROP ROLE statement is used to drop an existing role with its attributes. In the case of dependent objects, the DROP OWNED statement is used.

In PostgreSQL, the “\du” and “\du+” statements are used to show the list of users along with their attributes and descriptions.