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Education

This is the Education section of the Command Prompt Website. Here you will find blogs specifically about how to use Postgres and related technologies.

How to Use LOG() Function in PostgreSQL

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

How to Use CEIL() Function in PostgreSQL

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.

How to Use TRUNC() Function in PostgreSQL

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.

PostgreSQL INTEGER Data Type With Examples

In PostgreSQL, the INTEGER data type facilitates the user to store the numerical data between the range of -2,147,483,648 to +2,147,483,647 numbers.

How to Use Temporary Table in PostgreSQL

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.

PostgreSQL List All Tables

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.

How to Alter Role in PostgreSQL

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.

How to Use GRANT Statement in PostgreSQL

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

How to Use REVOKE Privileges in PostgreSQL

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

How to Drop Roles in PostgreSQL

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.