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Snowflake Cookbook

You're reading from Snowflake Cookbook Techniques for building modern cloud data warehousing solutions

Product type Paperback

Published in Feb 2021

Publisher Packt

ISBN-13 9781800560611

Length 330 pages

Edition 1st Edition

Languages

Python

Tools

Cloud Foundry

Concepts

Data Science

Authors (2):

Hamid Mahmood Qureshi

Hammad Sharif

View More author details

Table of Contents (12) Chapters

Preface

1. Chapter 1: Getting Started with Snowflake

2. Chapter 2: Managing the Data Life Cycle FREE CHAPTER

3. Chapter 3: Loading and Extracting Data into and out of Snowflake

4. Chapter 4: Building Data Pipelines in Snowflake

5. Chapter 5: Data Protection and Security in Snowflake

6. Chapter 6: Performance and Cost Optimization

7. Chapter 7: Secure Data Sharing

8. Chapter 8: Back to the Future with Time Travel

9. Chapter 9: Advanced SQL Techniques

10. Chapter 10: Extending Snowflake Capabilities

11. Other Books You May Enjoy

Unique counts and Snowflake

Estimating unique counts for rows in distributed systems is a compute-intensive process. Snowflake uses a distributed algorithm that is state of the art. This technique is different from those used in other databases. It is faster but, at the same time, approximate. The recipe shall show you how to use the uniqueness functions that are available in Snowflake.

Getting ready

Note that this recipe's steps can be run either in the Snowflake WebUI or the SnowSQL command-line client. An extra small warehouse will be used in the recipe.

How to do it…

As part of this recipe, we shall explore the different count functions/capabilities of Snowflake. We shall start with the typical count and distinct count functions and how different combinations can yield different results. Then, we shall explore the HyperLogLog algorithm implementation in Snowflake, which can efficiently approximate count over groups. This is recommended for use cases where...

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Authors (2)

Hamid Mahmood Qureshi

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.

See other products by Hamid Mahmood Qureshi

Hammad Sharif

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.

See other products by Hammad Sharif

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