NDLI: Queries with CASE expressions

Content Provider	Springer Nature Link
Author	Gryz, Jarek Wang, Qiong Qian, Xiaoyan Zuzarte, Calisto
Copyright Year	2009
Abstract	In recent years more and more queries are generated automatically by query managers/builders with end-users providing only specific parameters through GUIs. Queries generated automatically can be quite different from queries written by humans. In particular, they contain non-declarative features, most notorious of which is the CASE expression. Current query optimizers are often ill-prepared for the new types of queries as they do not deal well with procedural ‘insertions’. In this paper, we discuss the inefficiencies of CASE expressions and present several new optimization techniques to address them. We also describe experimental evaluation of the prototype implemented in DB2 UDB V8.2.
Starting Page	345
Ending Page	366
Page Count	22
File Format	PDF
ISSN	09259902
Journal	Journal of Intelligent Information Systems
Volume Number	34
Issue Number	3
e-ISSN	15737675
Language	English
Publisher	Springer US
Publisher Date	2009-05-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Database systems Query optimization Business Information Systems Document Preparation and Text Processing Artificial Intelligence (incl. Robotics) Data Structures, Cryptology and Information Theory
Content Type	Text
Resource Type	Article
Subject	Artificial Intelligence Computer Networks and Communications Information Systems Software Hardware and Architecture

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Queries with CASE expressions