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

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How to Check PostgreSQL Version on Ubuntu

To check the PostgreSQL version in Ubuntu, use the "SQL Shell" (psql) tool, “pg_config”, “dpkg”, or “apt-cache” commands.

How to Add Minutes to a Time in PostgreSQL

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

How to Connect to Postgres Database Server

In Postgres, various tools, such as the “SQL Shell”, “pgAdmin”, and “Command Prompt” are used to connect to a Postgres database server.

How to Find Difference Between Two Dates in PostgreSQL

In Postgres, the “-” operator and the AGE() function are used to find the date difference. The “-” operator returns an integer while the AGE() function returns an interval.

How to Return Data from Modified Rows in PostgreSQL

In PostgreSQL, use the RETURNING clause with the UPDATE, DELETE, or INSERT commands to return the modified rows.

PostgreSQL Timestamp Data Types With or Without Precision

In PostgreSQL, to get a timestamp without precision, users need to specify “0” as an argument to the timestamp data type or timestamp functions.

How to Select All From a Table in PostgreSQL

The SELECT statement is executed with the “*” symbol to select all data from a particular Postgres table. Use the ORDER BY clause with the SELECT * command to sort a table in a specific order.

How to Compare Dates in PostgreSQL?

To perform the date comparison in Postgres, the “BETWEEN” clause, the “DATE_TRUNC()” function, and the basic comparison operators like “=”, “!=”, “>=” etc., are used.

PostgreSQL JSON_AGG() Function By Practical Examples

In PostgreSQL, the JSON_AGG() function is used to combine multiple values into a single JSON array. The return type of the JSON_AGG() function is JSON.


Postgres’ ALTER DATABASE command modifies the already existing databases, such as renaming a database, modifying the database attributes, changing the database ownership, etc.