You're reading from Snowflake Cookbook

Product typeBook

Published inFeb 2021

Reading LevelBeginner

PublisherPackt

ISBN-139781800560611

Edition1st Edition

Languages

Python

Tools

Cloud Foundry

Concepts

Data Science

Authors (2):

Hamid Mahmood Qureshi

Hammad Sharif

View More author details

Creating a Scalar user-defined function using SQL

Snowflake provides capabilities for creating UDFs that can extend the system and perform operations not available out of the box in Snowflake. Snowflake allows two languages for the creation of UDFs, SQL-based UDFs, and JavaScript-based UDFs. Either of the UDF types can return scalar or table results.

In this recipe, we will be walking you through the creation of SQL-based Scalar UDFs and demonstrating how to call the UDFs for various scenarios. A scalar UDF can return a single row of results consisting of a single column, which is essentially equivalent to returning a single value.

Getting ready

You will need to be connected to your Snowflake instance via the web UI or the SnowSQL client to execute this recipe.

How to do it...

We will be creating a series of UDFs to demonstrate the various SQL UDF capabilities provided by Snowflake. We will start by creating a relatively simple UDF and will slowly increase the complexity...

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Snowflake Cookbook

Published in: Feb 2021Publisher: PacktISBN-13: 9781800560611

Authors (2)

Hamid Mahmood Qureshi

Hamid Qureshi is a senior cloud and data warehouse professional with almost two decades of total experience, having architected, designed, and led the implementation of several data warehouse and business intelligence solutions. He has extensive experience and certifications across various data analytics platforms, ranging from Teradata, Oracle, and Hadoop to modern, cloud-based tools such as Snowflake. Having worked extensively with traditional technologies, combined with his knowledge of modern platforms, he has accumulated substantial practical expertise in data warehousing and analytics in Snowflake, which he has subsequently captured in his publications.
Read more about Hamid Mahmood Qureshi

Hammad Sharif

Hammad Sharif is an experienced data architect with more than a decade of experience in the information domain, covering governance, warehousing, data lakes, streaming data, and machine learning. He has worked with a leading data warehouse vendor for a decade as part of a professional services organization, advising customers in telco, retail, life sciences, and financial industries located in Asia, Europe, and Australia during presales and post-sales implementation cycles. Hammad holds an MSc. in computer science and has published conference papers in the domains of machine learning, sensor networks, software engineering, and remote sensing.
Read more about Hammad Sharif

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Creating a Scalar user-defined function using SQL

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Authors (2)

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