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 ...
... ______ 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
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
Database
... The bar and beer together are the key for Sells: CREATE TABLE Sells ( bar CHAR(20), beer ...
... 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:
... 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 ...
... 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
... Relational Query Languages Language in which user requests information from the database. Categories of languages ...
... Relational Query Languages Language in which user requests information from the database. Categories of languages ...
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 ...
... 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
... • 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 ...
... • 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
... 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 ...
... 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
... 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: ...
... 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: ...
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 ...
... 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
... Many commercial systems are not fully relational because they do not support domains and integrity rules Classified as relationally complete ...
... Many commercial systems are not fully relational because they do not support domains and integrity rules Classified as relationally complete ...
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) ...
... 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
... 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 ...
... 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
... – 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 ...
... – 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
... 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. ...
... 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)
... name but the schema of the relation is the set of attributes that are ...
... name but the schema of the relation is the set of attributes that are ...
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 ...
... • 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
... • Basically limited by HDFS streaming speeds – Speed of encoding/decoding tuples becomes important – Relational databases take advantage of compression – Semistructured data? No problem! ...
... • 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
... 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 ...
... 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 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 ...
... 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
... ______ 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 ...
... ______ 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
... • Header size + size of tuples = BufferPool.PAGE_SIZE ...
... • Header size + size of tuples = BufferPool.PAGE_SIZE ...
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. ...
... foreign key value must match a candidate key value of some tuple in its home relation or foreign key value must be wholly null. ...