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Logic and Databases
Logic and Databases

... • Logic provides both a unifying framework and a set of tools for formalizing and studying data management tasks. • The interaction between logic and databases is a prime example of – Logic in Computer Science but also – Logic from Computer Science ...
www.ipeirotis.com
www.ipeirotis.com

... Problem 1: Random sampling may retrieve non-representative documents Solution: Focus querying on “topically dense” areas of the database Problem 2: Frequencies are “compressed” to the sample size range Solution: Exploit number of matches for query and adjust estimates using curve fitting Problem 3: ...
Chapter 5: Other Relational Languages
Chapter 5: Other Relational Languages

... Null Values  It is possible for tuples to have a null value (denoted by null) for some of their ...
PPT - Electrical and Computer Engineering Department
PPT - Electrical and Computer Engineering Department

... Null Values  It is possible for tuples to have a null value, denoted by null, for some ...
ON SECOND THOUGHT: LOW-EFFORT THOUGHT PROMOTES
ON SECOND THOUGHT: LOW-EFFORT THOUGHT PROMOTES

... of dual-processes models. I simply investigate whether values operate in a pattern consistent with automatic and controlled processing. Dual-process accounts of attitudes may help explain variations in values under different levels of thought processing since values are abstract standards that under ...
Chapter 1
Chapter 1

... an overarching multitenant container database. A multitenant container database (CDB) is defined as a database capable of housing one or more pluggable databases. A container is defined as a collection of data files and metadata that exist within a CDB. A pluggable database is a special type of cont ...
Formal Relational Query Languages
Formal Relational Query Languages

... Null Values  It is possible for tuples to have a null value, denoted by null, for some ...
Monitoring Secrets for SAP
Monitoring Secrets for SAP

... Every instance has a number between 00 and 99, the socalled instance number (abbreviated by InstNr or NN to indicate the numerical value). The installation default is 00. If more than one instance is installed on the same host, they MUST have different InstNr. InstNrs are usually part of the Port nu ...
Computing Consistent Query Answers using Conflict
Computing Consistent Query Answers using Conflict

... The main contributions of this paper are as follows: • A complete, scalable framework for computing consistent answers to projection-free relational algebra queries in the presence of denial constraints. Our approach uses a relational DBMS as a backend and scales up to large databases. • Novel optim ...
Document
Document

... Database  A database consists of multiple relations  Information about an enterprise is broken up into parts, with each ...
from instructor
from instructor

...  IBM Sequel language developed as part of System R project at the ...
Chapter 1: Introduction
Chapter 1: Introduction

...  IBM Sequel language developed as part of System R project at the ...
An approach to the model-based fragmentation and
An approach to the model-based fragmentation and

... the file system, which is straightforward but does not support querying XML data, object-oriented database systems as well as systems based on semi-structured data models or native XML systems volunteer. However, comparative studies [4, 6, 7, 8] indicate, that relational or object-relational databas ...
Database Repairing and Consistent Query Answering Database
Database Repairing and Consistent Query Answering Database

... Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely ...
Chapter 1: Introduction
Chapter 1: Introduction

...  IBM Sequel language developed as part of System R project at the ...
r – s
r – s

... Database System Concepts ...
School of Geosciences Thesis template
School of Geosciences Thesis template

... Figure 4.1. The relationship between the CMI and relevant social groups ............................. 47 Figure 4.2. Variation of meaning across social groups............................................................ 48 Figure 4.3. Variation of meaning for a single social group ................... ...
Document
Document

... – On receipt of PREPARE message from cohort, mark cohort as PREPARED. If all cohorts PREPARED, then change status to COMMITTED and send COMMIT message.  must force a commit log record to disk before sending commit message. – on receipt of ACK message from cohort, mark cohort as ACKED. When all coho ...
Query Example
Query Example

... Query By Example (GQBE)  GQBE differs from QBE in the following ways ...
Automated Ranking of Database Query Results
Automated Ranking of Database Query Results

... latter specified as a set of keywords), the problem is to retrieve the Top-K documents most relevant, or most similar to the query. Similarity between a document and the query is formalized as follows. Given a vocabulary of m words, a document is treated as an m-dimensional vector, where the ith com ...
Query-by-Example (QBE)
Query-by-Example (QBE)

... Query By Example (GQBE)  GQBE differs from QBE in the following ways ...
An Architecture for Homogenizing Federated Databases
An Architecture for Homogenizing Federated Databases

... Case base ...
Introduction to SQL
Introduction to SQL

... some of their attributes  null signifies an unknown value or that a value does not exist.  The result of any arithmetic expression involving null is null ...
Chapter 14: Query Optimization
Chapter 14: Query Optimization

Chapter 14: Query Optimization
Chapter 14: Query Optimization

... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n)  Space complexity remains at O(2n) Cost-based optimization is expensive, but worthwhile for queries on large datasets (typical queries have small n, generally < 10) ...
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Encyclopedia of World Problems and Human Potential

The Encyclopedia of World Problems and Human Potential is published by the Union of International Associations (UIA) under the direction of Anthony Judge. It is available as a three-volume book, as a CD-ROM, and online.The Encyclopedia was started in 1972 and now comprises more than 100,000 entries and 700,000 links, as well as 500 pages of introductory notes and commentaries. The Encyclopedia collects information on problems, strategies, values, concepts of human development, and various intellectual resources.
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