Learn how Teradata stores dates internally as INTEGER values and how to efficiently calculate dates after 1900-01-01 using a simple formula. Get more useful Teradata date calculations in this article.
Teradata UNION ALL – The New Features of Release 16 Teradata 16 introduces new features for UNION ALL queries that can enhance their performance, although their application is not guaranteed. The Optimizer will opt for executing the query through conventional methods if the cost estimations for the traditional execution plan are lower. It is crucial …
TO_NUMBER I have often needed a function to verify whether a character column contains a numeric value. Typically, I have resorted to using a workaround, such as: CASE WHEN UPPER(‘12.77’) = LOWER(‘12.77’) THEN ‘IS_NUMERIC’ ELSE ‘IS_NOT_NUMERIC’ END Naturally, this workaround is limited and cannot manage certain situations, such as consecutive special characters. With the introduction …
Teradata administrators worldwide face similar challenges. I propose creating a worldwide database containing the characteristics of Teradata systems. This will allow for easy comparison and analysis of performance issues between different systems. My initial report displays the CPU idle time and the number of disk I/O waits for every hour throughout the day. To contribute …
Introduction to Teradata Recursions To link records from a primary table with a specific date range from a secondary table, a common requirement is to create a simulated history table with snapshot dates using a change history table with defined timelines. Consider the following illustration: The proposed solution would resemble this: You must create your …
Learn how the CHAR2HEXINT function helped solve a real-world problem of extracting number parts from a string in Teradata SQL. Read on for the solution.
Learn how to improve the performance of SQL statements by rewriting them through this article on Teradata tuning. Follow along as we analyze a high-runtime SQL statement and optimize it to significantly reduce disk I/O and spool space usage.
Learn about optimizing SQL queries in Teradata 14.10 by analyzing the execution plan of two queries and using statistics on columns and expressions.
Learn how the Teradata CLOB datatype can improve query performance and reduce resource consumption for storing longer texts in your database.
Learn how to work with Teradata OLAP Functions in your data warehouse applications. This systematic approach covers five key design decisions.
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