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  • Book Overview & Buying Teradata Cookbook
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Teradata Cookbook

Teradata Cookbook

By : Abhinav Khandelwal, Rajsekhar Bhamidipati
3.8 (4)
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Teradata Cookbook

Teradata Cookbook

3.8 (4)
By: Abhinav Khandelwal, Rajsekhar Bhamidipati

Overview of this book

Teradata is an enterprise software company that develops and sells its eponymous relational database management system (RDBMS), which is considered to be a leading data warehousing solutions and provides data management solutions for analytics. This book will help you get all the practical information you need for the creation and implementation of your data warehousing solution using Teradata. The book begins with recipes on quickly setting up a development environment so you can work with different types of data structuring and manipulation function. You will tackle all problems related to efficient querying, stored procedure searching, and navigation techniques. Additionally, you’ll master various administrative tasks such as user and security management, workload management, high availability, performance tuning, and monitoring. This book is designed to take you through the best practices of performing the real daily tasks of a Teradata DBA, and will help you tackle any problem you might encounter in the process.
Table of Contents (14 chapters)
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Working with correlated subqueries


A correlated subquery (CS) is a subquery whose outer query results are processed a row at a time, against the subquery result. The subquery result is computed for each row processed. The following are advantages of subqueries:

  • Helps in eliminating the need for intermediate or temporary tables. Reduces user temp space and spool.
  • Helps in minimizing joining costs.
  • If used effectively, is significantly faster than the query using temporary tables.

Now, let's understand the workings of different types of queries in Teradata from the figure:

Ordinary Sub Query: In this case, the inner query is executed only once, and the output of the inner query is used by the outer query. The inner query is not dependent on the outer query:

/*Sub query*/
SELECT
Column1, Column2 FROM 
Table1 
WHERE Column1 IN (SELECT Column1 FROM Table1);

Correlated Sub Query: In this case, the outer query will be executed first, and for every row of the outer query, the inner query will be getting...

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Teradata Cookbook
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