Book Image

SQL Query Design Patterns and Best Practices

By : Steve Hughes, Dennis Neer, Dr. Ram Babu Singh, Shabbir H. Mala, Leslie Andrews, Chi Zhang
5 (1)
Book Image

SQL Query Design Patterns and Best Practices

5 (1)
By: Steve Hughes, Dennis Neer, Dr. Ram Babu Singh, Shabbir H. Mala, Leslie Andrews, Chi Zhang

Overview of this book

SQL has been the de facto standard when interacting with databases for decades and shows no signs of going away. Through the years, report developers or data wranglers have had to learn SQL on the fly to meet the business needs, so if you are someone who needs to write queries, SQL Query Design and Pattern Best Practices is for you. This book will guide you through making efficient SQL queries by reducing set sizes for effective results. You’ll learn how to format your results to make them easier to consume at their destination. From there, the book will take you through solving complex business problems using more advanced techniques, such as common table expressions and window functions, and advance to uncovering issues resulting from security in the underlying dataset. Armed with this knowledge, you’ll have a foundation for building queries and be ready to shift focus to using tools, such as query plans and indexes, to optimize those queries. The book will go over the modern data estate, which includes data lakes and JSON data, and wrap up with a brief on how to use Jupyter notebooks in your SQL journey. By the end of this SQL book, you’ll be able to make efficient SQL queries that will improve your report writing and the overall SQL experience.
Table of Contents (21 chapters)
Part 1: Refining Your Queries to Get the Results You Need
Part 2: Solving Complex Business and Data Problems in Your Queries
Part 3: Optimizing Your Queries to Improve Performance
Part 4: Working with Your Data on the Modern Data Platform

Required security and storage permissions

The big question that comes to mind while accessing files stored in Azure Storage services is, do we have enough privilege to read the content from the files? This section explains this in detail and walks through a scenario on how to enable this.

There are the following three methods for enabling access:

  • Role-based access control (RBAC) (short for role-based access control): This assigns a role to an Azure AD user on Azure Storage where files are stored and need to be read by using the OPENROWSET () function. The user must have the Storage Blob Data Reader, Storage Blob Data Contributor, or Storage Blob Data Owner RBAC role to the Storage account, but if you are trying to write back on the Storage service, you need the Storage Blob Data Contributor or Storage Blob Data Owner role.
  • An access control list (ACL): This assigns a more granular Read, Write, and Execute permission on the files and directories in the Storage service...