---
title: "Discussion on \"Efficient calculation of an ISBN-13 check digit\" | Hashnode"
description: "Discussion on \"Efficient calculation of an ISBN-13 check digit\". I thought I might pass along, what I have found to be, the most efficient way to validate the check digit within Azure SQL Server. I was looking to go down the path of a CLR, but it turns out that seems to be frowned upon. The function returns Y/N. F..."
url: "https://hashnode.com/posts/efficient-calculation-of-an-isbn-13-check-digit/64ab58e6422a57130c11d1e8"
---

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# [Efficient calculation of an ISBN-13 check digit](https://josefrichberg.com/efficient-calculation-of-an-isbn-13-check-digit?utm_source=hashnode&utm_medium=feed)

I thought I might pass along, what I have found to be, the most efficient way to validate the check digit within Azure SQL Server. I was looking to go down the path of a CLR, but it turns out that seems to be frowned upon. The function returns Y/N. F...

Jul 10, 2023 · 1 min read · josefrichberg.com  
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-   [#sql-server](https://hashnode.com/tag/sql-server)
-   [#t-sql](https://hashnode.com/tag/t-sql)
-   [#book-publishing](https://hashnode.com/tag/book-publishing)

## Written by

[Josef Richberg](https://hashnode.com/@josefrichberg)

@josefrichberg · Pennsylvania, US

  
[View profile](https://hashnode.com/@josefrichberg)

Principal Data Architect, Azure @ Penguin Random House

I've been working in and around SQL for over 3 decades. I am currently working on making our business intelligence systems self-driven by using an event-based architecture. This involves providing curated data in some of the largest SQL Azure Analysis Services cubes ever built (over 6 billion records in 1 table alone). I've developed several APIs leveraging a serverless Azure architecture to provide real-time data to various internal processes and projects. Currently working on Project Dormouse; Durable select messaging queue that enables polling processes to extract specific messages.

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