'Semi join' presentation slideshows

Relational Algebra and My SQL

907 views • 80 slides

Distributed Databases

Distributed Databases. Fragmentation vs Query optimization. Query Processing Steps. Decomposition Given SQL query, generate one or more algebraic query trees Localization Rewrite query trees, replacing relations by fragments Optimization

643 views • 46 slides

distributed databases

distributed databases. Recap: parallel databases. Three possible architectures Shared-memory Shared-disk Shared-nothing (the most common one) Parallel algorithms Intra-operator Scans, projections, joins, sorting, set operators, etc. Inter-operator

691 views • 45 slides

Database Systems 04 Relational Algebra

Database Systems 04 Relational Algebra. Last update: Mar 25, 2019. Announcements/Org. #1 Video Recording Since last week, video/audio recording Link in TeachCenter & TUbe (but not public yet) #2 Exercise Submission Submission through TeachCenter (max 5MB, draft possible)

352 views • 32 slides

Relational Algebra 2 (Joins)

M Taimoor Khan taimoorkhan@ciit-attock.edu.pk. Relational Algebra 2 (Joins). Course Objectives. Basic Concepts Tools Database architecture and design Flow of data (DFDs) Mappings (ERDs) Formulating queries (Relational algebra) Implementing Schema Built-in Functions Extracting data

365 views • 24 slides

A Comparison of Join Algorithms for Log Processing in MapReduce

A Comparison of Join Algorithms for Log Processing in MapReduce. SIGMOD 2010 Spyros Blanas , Jignesh M. Patel, Vuk Ercegovac , Jun Rao , Eugene J. Shekita , Yuanyuan Tian University of Wisconsin-Madison, IBM Almaden Research Center 2011-01-21 Summarized by Jaeseok Myung.

568 views • 21 slides

By Santosh Kumar Nukavarapu

A Comparison of Join Algorithms for Log Processing in MapReduce Spyros Blanas, Jignesh M. Patel, Vuk Ercegovac, Jun Rao, Eugene J. Shekita, Yuanyuan Tian. By Santosh Kumar Nukavarapu. Contents. Introduction Requirement Log Processing and MapReduce Join Algorithms in Map Reduce

399 views • 17 slides

INNER JOIN (EQUI-JOIN) Predicate

INNER JOIN (EQUI-JOIN) Predicate. source tables. SELECT * FROM employee, department WHERE employee.DepartmentID = department.DepartmentID. is equivalent to. SELECT * FROM employee INNER JOIN department ON employee.DepartmentID = department.DepartmentID.

786 views • 9 slides