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Getting Started with CockroachDB

You're reading from   Getting Started with CockroachDB A guide to using a modern, cloud-native, and distributed SQL database for your data-intensive apps

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Product type Paperback
Published in Mar 2022
Publisher Packt
ISBN-13 9781800560659
Length 246 pages
Edition 1st Edition
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Author (1):
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Kishen Das Kondabagilu Rajanna Kishen Das Kondabagilu Rajanna
Author Profile Icon Kishen Das Kondabagilu Rajanna
Kishen Das Kondabagilu Rajanna
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Table of Contents (17) Chapters Close

Preface 1. Section 1: Getting to Know CockroachDB
2. Chapter 1: CockroachDB – A Brief Introduction FREE CHAPTER 3. Chapter 2: How Does CockroachDB Work Internally? 4. Section 2: Exploring the Important Features of CockroachDB
5. Chapter 3: Atomicity, Consistency, Isolation, and Durability (ACID) 6. Chapter 4: Geo-Partitioning 7. Chapter 5: Fault Tolerance and Auto-Rebalancing 8. Chapter 6: How Indexes Work in CockroachDB 9. Section 3: Working with CockroachDB
10. Chapter 7: Schema Creation and Management 11. Chapter 8: Exploring the Admin User Interface 12. Chapter 9: An Overview Of Security Aspects 13. Chapter 10: Troubleshooting Issues 14. Chapter 11: Performance Benchmarking and Migration 15. Other Books You May Enjoy Appendix: Bibliography and Additional Resources

Column-level constraints

Constraints are rules that are enforced on data columns in a table. Whenever there is any change in data within a table, all the constraints are verified to make sure none is violated. If violated, the changes are rejected with the appropriate error message. Here is a list of column-level constraints:

  • CHECK <condition>: A given condition is checked whenever a value is being inserted into the table. The condition is a Boolean expression that should evaluate to TRUE or NULL. If it returns FALSE for any value, the entire statement is rejected. It is possible to have multiple checks for the same column.

Here's an example to illustrate this:

CREATE TABLE user (
id INT NOT NULL, 
name STRING NOT NULL,
age INT NOT NULL CHECK (age > 18) CHECK (age < 65), 
PRIMARY KEY (id)
);
  • DEFAULT: The DEFAULT value constraint is exercised whenever the INSERT statement doesn't explicitly insert a specific value or NULL for the column...
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