Postgres and Open Source Experts

The DROP command throws an error if a table to be dropped doesn’t exist while “DROP IF EXISTS” shows a notice instead of throwing an error.

In Postgres, the SELECT DISTINCT clause fetches only unique values from a result set returned by a query. It retains only one row from a set of duplicated rows.

In PostgreSQL, the COALESCE() function handles the null values more efficiently. It accepts unlimited arguments and returns the first non-null argument.

PostgreSQL doesn’t provide a DATEADD function to add an interval to date time. However, you can achieve the same functionality using the “+” and “-” operators.

PostgreSQL provides various functions, such as LOWER(), INITCAP(), or UPPER(), to alter a string to lowercase, proper case, and uppercase, respectively.

PostgreSQL offers multiple date/time functions, such as CURRENT_DATE, NOW(), EXTRACT(), CURRENT_TIMESTAMP, etc. If we talk about the CURRENT_TIMESTAMP function, it retrieves the current date, time, and timezone when a transaction starts.

This write-up will present a thorough overview of the Postgres CURRENT_TIMESTAMP function with examples. So, let’s begin.

How to Use CURRENT_TIMESTAMP Function in PostgreSQL?

Firstly, let’s understand the syntax of the CURRENT_TIMESTAMP function:

CURRENT_TIMESTAMP(<precision>);

Here, “precision” is an optional …

In PostgreSQL, we can use the "DELETE USING" statement, subquery, or Postgres immediate table to delete duplicate rows from a table.

In PostgreSQL, the MIN() function retrieves a set's minimum value. Use the LEAST() function to get the minimum/least value from more than one column

PostgreSQL offers a built-in MAX() function that is used to retrieve the maximum value of a set. The MAX() function has multiple real-life implementations, such as fetching the highest-paid employee, finding a top-ranked student, and so on. So, let’s learn the working of the MAX() function through Practical examples.

How to Use MAX() Function in Postgres?

The below snippet will show you the basic syntax of the MAX() function:

MAX(exp); …

In PostgreSQL, the AVG() function is used to retrieve the average of a set. The DISTINCT operator is used with the AVG() function to find the average of distinct values.