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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 Sort Multiple Columns Using ORDER BY Clause in PostgreSQL

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

How to Get the Month Name From a Date in PostgreSQL

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.

How to Use pg_size_pretty() Function in PostgreSQL

In PostgreSQL, the pg_size_pretty() function retrieves the size of the database object in a human-readable format, such as KB, MB, etc.

How to Use LPAD() Function in PostgreSQL

LPAD() or “left 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 left side.

How to Generate Random Numbers in PostgreSQL

In Postgres, the RANDOM() is an in-built function that generates a random numeric value between “0(inclusive)” and “1(exclusive)” or between a specific range.

How to Format a TIMESTAMP in PostgreSQL

To format a timestamp, specify a timestamp and a valid format as arguments to the Postgres TO_CHAR() function.

How to Convert EPOCH Time to Timestamps in PostgreSQL

In PostgreSQL, to convert the epoch time to a timestamp, pass the EPOCH time as an argument to the TO_TIMESTAMP() function.

How to Set a TIMESTAMP as a Default Column Value in PostgreSQL

Postgres allows us to set a TIMESTAMP as the column’s default value. For this purpose, the DEFAULT keyword is used with the column name at the time of table creation.

How to Compare Arrays in PostgreSQL

To compare arrays in PostgreSQL, the equality operators, ordering operators, containment operators, and overlap operators are used.

How to Calculate EPOCH Time in PostgreSQL

In PostgreSQL, to extract epoch time from the current or specific time, the EXTRACT() function is used with the EPOCH argument.