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Exam 2
Exam 2

... ______ A 1NF relation disallows null values and multi-valued attributes. ______ The primary key of a 3NF relation is exactly one attribute. ______ Normalization attempts to identify and then reduce or eliminate redundant facts stored in a database table tuple through decomposition. ______ A lossless ...
Chapter 2: Intro to Relational Model
Chapter 2: Intro to Relational Model

... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
Database
Database

...  The bar and beer together are the key for Sells: CREATE TABLE Sells ( bar CHAR(20), beer ...
1) Write SQL Statements to create the following tables:
1) Write SQL Statements to create the following tables:

...  What is the name of director number 8?  List the titles numbers and directors names of all movies that have been made after 1988. 4) Map the above database tables to a Relational Schema. 5) Map the Relational Schema to an Entity Relationship Schema ...
Chapter 1: Introduction
Chapter 1: Introduction

... Relational Query Languages  Language in which user requests information from the database.  Categories of languages ...
database management system
database management system

... hardware and is concerned with low-level access methods and byte transfer to and from the storage device.  The conceptual level of a DBMS defines the logical view of the data as well as the data model and schema ...
database - CyberInfrastructure and Geospatial Information Laboratory
database - CyberInfrastructure and Geospatial Information Laboratory

... • Each relation has a set of attributes • The data in the relation is structured as a set of rows, often called tuples • Each tuple consists of data items for each attribute • Each cell in a tuple contains a single value • A relational database management system (RDBMS) is the software that manages ...
Effective Keyword-Based Selection of Relational Databases
Effective Keyword-Based Selection of Relational Databases

... recall – compares the accumulated score of the top l databases selected based on the summaries of the source databases against the total available score when we select top l databases according to real ranking (summaries vs. real ranking) precision – measures the fraction of the top l selected datab ...
Relational Algebra - KFUPM Faculty List
Relational Algebra - KFUPM Faculty List

... STUDENT.dat and SKILLS.dat. The data file for relations contains the number of tuples in the first line followed by the description of each tuple. Tuples are described by the values under each column with each vale in a separate line. For example, let the SKILLS relation have three tuples: ...
Relational Data structure
Relational Data structure

The Relational Model
The Relational Model

... Additional Operation • Natural-Join Operation: forms a Cartesian product of its two arguments, performs a selection forcing equality on those attributes that appears in both relations and removes any duplicates – Πcustomer-name, loan-number, amount (borrower – Πcustomer-name, loan-number, amount ...
The relational model
The relational model

... Many commercial systems are not fully relational because they do not support domains and integrity rules Classified as relationally complete ...
Document
Document

Modeling access Queries Relational query languages Relational model:
Modeling access Queries Relational query languages Relational model:

... if p(t) is true for tuple t, then attributes of t are in Domain(I, Q) 3.  For each ∀T(p(T)) in the formula of Q, if t is a tuple containing a constant not in Domain(I,Q), then p(t) is true => Only need to test tuples in Domain(I,Q) ...
Document
Document

... An expression can be assigned a name using as  Example select FlashlineID as ID from student Note: as is rename clause, also can be used to rename table name select name as myname from student as S ...
ppt format
ppt format

... – three types: left outer join, right outer join, and full outer join – left outer join computes the natural join, then takes all tuples (rows) in the left relation that did not match on the join attribute and includes them in the result, with all attributes of the right relation padded with null va ...
Link - Faculty
Link - Faculty

... Only process three attributes of the relation CUSTOMER. But the customer relation can have more than three attributes. Column-stores are more I/O efficient for read-only queries as they read, only those attributes which are accessed by a query. ...
SQL (Structured Query Language)
SQL (Structured Query Language)

... name but the schema of the relation is the set of attributes that are ...
Chapter 16 - Computer Information Systems
Chapter 16 - Computer Information Systems

... • Examine logical data model and data dictionary, and produce list of all derived attributes. • Derived attribute can be stored in database or calculated every time it is needed. • Option selected is based on: – additional cost to store the derived data and keep it consistent with operational data f ...
Reduce
Reduce

... • Basically limited by HDFS streaming speeds – Speed of encoding/decoding tuples becomes important – Relational databases take advantage of compression – Semistructured data? No problem! ...
ppt - DUET
ppt - DUET

... relation in the mathematical sense. Also called tables.  A database therefore is a collection of tables, each of which has a unique name, and each of which is described by a ...
syllabus - Florida International University
syllabus - Florida International University

... Syllabus for COP-4710 Summer 2017 Text: "Fundamentals of Database Systems" - 7th Edition - by Elmasri and Navathe. Class webpage: www.cs.fiu.edu/~navlakha/4710/db.html Syllabus: The following topics, not necessarily in this order, will be discussed. - Database system concepts and architecture - Rela ...
Exam 2
Exam 2

... ______ A 1NF relation has no null values or multi-valued attributes. ______ A 1NF relation’s primary key is exactly one attribute. ______ Normalization attempts to reduce or eliminate redundant facts stored in a database table tuple. ______ Decomposition of a table for normalization results in two o ...
SimpleDB Overview - Massachusetts Institute of Technology
SimpleDB Overview - Massachusetts Institute of Technology

... • Header size + size of tuples = BufferPool.PAGE_SIZE ...
Relational Database
Relational Database

... foreign key value must match a candidate key value of some tuple in its home relation or foreign key value must be wholly null. ...
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Relational algebra

Relational algebra, first described by E.F. Codd while at IBM, is a family of algebra with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it.The main application of relational algebra is providing a theoretical foundation for relational databases, particularly query languages for such databases, chief among which is SQL.
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