July 2010
Intermediate to advanced
840 pages
16h 33m
English
Content preview from Joe Celko's SQL for Smarties, 3rd Edition
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Chapter 31. OLAP in SQL
THIS MATERIAL WAS PROVIDED by Michael L. Gonzales from his book, The IBM Data Warehouse (Gonzales 2003), as well as his article “The SQL Language of OLAP,” (Gonzales 2004).
Most SQL programmers work with OLTP (Online Transaction Processing) databases and have had no exposure to Online Analytic Processing (OLAP) and data warehousing. OLAP is concerned with summarizing and reporting data, so the schema designs and common operations are very different from the usual SQL queries.
As a gross generalization, everything you knew in OLTP is reversed in a data warehouse:
| 1. | OLTP changes data in short, frequent transactions. A data warehouse is bulk-loaded with static data on a schedule, and the data remains constant once it is ... |
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