10% Discount on All E-Books through IGI Global’s Online Bookstore Extended(10% discount on all e-books cannot be combined with most offers. Discount is valid on purchases made directly through IGI Global Online Bookstore (www.igi-global.com)
and may not be utilized by booksellers and distributors. Offer does not apply to e-Collections and exclusions of select titles may apply. Offer expires December 31, 2022.)Browse Titles

Special Offers
- 10% Discount on All E-Books through IGI Global’s Online Bookstore
  With the continued paper shortages and supply chain issues, we have been informed by our partners that there will be substantial delays in printing and shipping publications, especially as we approach the holiday season. To help incentive the electronic format and streamline access to the latest research, we are offering a 10% discount on all our e-books through IGI Global’s Online Bookstore. Hosted on the InfoSci^® platform, these titles feature no DRM, no additional cost for multi-user licensing, no embargo of content, full-text PDF & HTML format, and more.
  Browse Titles
- IGI Global to Convert an Additional 30 Journals to Full Gold Open Access for the 2022 Volume Year
  IGI Global is to convert an additional 30 journals to full gold open access (OA) for their 2022 volume year, which will expand their OA collection to contain 60 gold open access and one (1) platinum open access journal.
  Learn More
- All IGI Global Scholarly Journals Shift to "Digital Preferred" Format
  In response to the overwhelming demand for electronic content coupled with the mission to decrease the overall environmental impacts of print production and distribution, all IGI Global journals will shift into a digital preferred model for the 2022 volume year. Under this model, journals will become primarily available under electronic format and articles will be immediately available upon acceptance. Print subscriptions and print + electronic subscriptions will still be available, but for the print version, all articles that are published during the volume year will become available at the end of the year in a single (1) printed volume.
  Learn More
- IGI Global’s New DEI e-Book Collection
  Acquire Over 320+ E-Books on Diversity, Equity, and Inclusivity from a publisher that has been dedicated to DEI since its inception over 30 years ago. Now, benefit from a collection of all of our DEI e-Books at a 90% Discount.
  Learn More
- Offering a 5% Pre-Publication Discount on
  All Reference Books Ordered Through IGI Global’s Online Bookstore*
  To support customers with accessing the latest research, IGI Global is offering a 5% pre-publication discount on all hardcover, softcover, e-books, and hardcover + e-books titles.
  *5% discount offer is eligible on hardcover, softcover, e-books, and hardcover + e-books titles and is automatically applied directly to the shopping cart. Discount offer only valid on purchases made directly through IGI Global’s Online Bookstore and offer expires 30 days after the publication’s release. This automatic discount is not intended for use by book distributors or wholesalers.
  Browse Titles
Books
Journals
e-Collections
- - e-Collections
  - Transformative Open Access (Read & Publish)
Open Access
Publish with Us
Resources
- - Instructors
  - Course Adoption
  - Teaching Cases
  - K-12 Online Learning Collection
  - Authors and Editors
  - eEditorial Discovery^® System
  - Peer Review Process
  - Ethics and Malpractice
  - COPE Membership
  - Fair Use Policy
  - Open Access Publishing
  - Author Services
  - FAQ
Catalogs
About Us
Newsroom

On Estimators for Aggregate Relational Algebra Queries

Kaizheng Du (Case Western Reserve University, USA) and Gultekin Ozsoyoglu (Case Western Reserve University, USA)

Source Title: Journal of Database Management (JDM) 8(1)

DOI: 10.4018/jdm.1997010103

OnDemand PDF Download:

Available

$37.50

Current Special Offers

No Current Special Offers

Abstract

CASE-DB is a relational database management system that allows users to specify time constraints in queries. For an aggregate query AGG(E) where AGG is one of COUNT, SUM and AVERAGE, and E is a relational algebra expression, CASE-DB uses statistical estimators to approximate the query. This paper extends our earlier work on statistical estimators of CASE-DB with the following features: (a) new statistical estimators for COUNT queries with projection, (b) extending the methodology for SUM and AVERAGE aggregate queries, (c) new sampling plans based on systematic sampling and stratified sampling. We also present performance evaluation experiments of the estimators with the above extensions using correlated and uncorrelated database instances.

Complete Article List

Search this Journal:

Reset

Open Access Articles

Volume 33: 4 Issues (2022): 2 Released, 2 Forthcoming

Volume 32: 4 Issues (2021)

Volume 31: 4 Issues (2020)

Volume 30: 4 Issues (2019)

Volume 29: 4 Issues (2018)

Volume 28: 4 Issues (2017)

Volume 27: 4 Issues (2016)

Volume 26: 4 Issues (2015)

Volume 25: 4 Issues (2014)

Volume 24: 4 Issues (2013)

Volume 23: 4 Issues (2012)

Volume 22: 4 Issues (2011)

Volume 21: 4 Issues (2010)

Volume 20: 4 Issues (2009)

Volume 19: 4 Issues (2008)

Volume 18: 4 Issues (2007)

Volume 17: 4 Issues (2006)

Volume 16: 4 Issues (2005)

Volume 15: 4 Issues (2004)

Volume 14: 4 Issues (2003)

Volume 13: 4 Issues (2002)

Volume 12: 4 Issues (2001)

Volume 11: 4 Issues (2000)

Volume 10: 4 Issues (1999)

Volume 9: 4 Issues (1998)

Volume 8: 4 Issues (1997)

Volume 7: 4 Issues (1996)

Volume 6: 4 Issues (1995)

Volume 5: 4 Issues (1994)

Volume 4: 4 Issues (1993)

Volume 3: 4 Issues (1992)

Volume 2: 4 Issues (1991)

Volume 1: 2 Issues (1990)

View Complete Journal Contents Listing

MLA

APA

Chicago

Export Reference

On Estimators for Aggregate Relational Algebra Queries

Abstract

Complete Article List