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Learning Apache Cassandra - Second Edition

You're reading from  Learning Apache Cassandra - Second Edition

Product type Book
Published in Apr 2017
Publisher
ISBN-13 9781787127296
Pages 360 pages
Edition 2nd Edition
Languages
Concepts

Table of Contents (14) Chapters

1. Getting Up and Running with Cassandra 2. The First Table 3. Organizing Related Data 4. Beyond Key-Value Lookup 5. Establishing Relationships 6. Denormalizing Data for Maximum Performance 7. Expanding Your Data Model 8. Collections, Tuples, and User-Defined Types 9. Aggregating Time-Series Data 10. How Cassandra Distributes Data 11. Cassandra Multi-Node Cluster 12. Application Development Using the Java Driver 13. Peeking under the Hood 14. Authentication and Authorization

Viewing a table schema in cqlsh


In this chapter, we'll be working with the users table, which we haven't had much interaction with since the early chapters. Before we start making changes to the users table, it would be helpful to have a reminder of what its schema looks like.

One option would be to simply issue a SELECT statement and look at the row headers; however, cqlsh gives us a more elegant way to view the schema, namely the DESCRIBE TABLE statement:

DESCRIBE TABLE "users"; 

The output is a CREATE TABLE statement showing the table's schema, as well as all properties for the table:

The part of the output beginning with WITH tells us the table properties for the users table; in this case, the properties are all set to their default values. We can ignore this part of the output as working with table properties goes beyond the scope of this book.

The important part of the output is at the top, listing the columns in the table and telling us which comprise the primary key. We're now reminded...

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