Postgres and Open Source Experts

Welcome back to our Citus blog series! So far in this series, we have installed and configured the Citus extension for PostgreSQL. Now that we are up and running, it is time to distribute some data.

Let’s begin by inserting some sample data for demonstration purposes. First, we need a table in which to put the data.

The REPEAT() function in Postgres is a string function that retrieves a string consisting of the given string repeated an ‘n’ number of times.

To get a day from a date, specify the “Day” as the first argument and a specific date, timestamp, or interval as the second argument to the EXTRACT().

In PostgreSQL, the SQRT() is a built-in mathematical function that accepts a positive numeric value and retrieves its square root.

PostgreSQL provides a built-in math function named MOD() that accepts numeric values as arguments, performs division, and retrieves the remainder after division.

The DIV() and MOD() functions in Postgres perform the division on numeric values. However, the DIV() function retrieves a quotient while the MOD() function retrieves the remainder.

The RIGHT() function takes a string and the number of characters to extract as arguments and retrieves the extracted/modified string.

SQL Shell supports various commands and queries to describe the Postgres tables, such as “\d”, “\d+”, information_schema, etc.

The LEFT() function takes a string and the number of characters to extract as arguments and retrieves the extracted/modified string.

Postgres offers several built-in functions and operators that are used to perform division on different numeric values, such as the “/” operator, DIV() function, MOD() function, etc.