1 - Abbsoft Computers
... __________ is the most important ____________. SQL is referred to as a relational___________. It also contains facilities to define ________. (SQL(Structured Query Language), relational data manipulation Language, Data Manipulation Language(DML), data definition Language) ...
... __________ is the most important ____________. SQL is referred to as a relational___________. It also contains facilities to define ________. (SQL(Structured Query Language), relational data manipulation Language, Data Manipulation Language(DML), data definition Language) ...
databaseR - File Storage
... Fundamental storage structures for data Tables are sometimes called files Looks like a spreadsheet Consist of rows (TUPLES) which are the equivalent of a record and columns (ATTRIBUTES) which are the equivalent of a field ...
... Fundamental storage structures for data Tables are sometimes called files Looks like a spreadsheet Consist of rows (TUPLES) which are the equivalent of a record and columns (ATTRIBUTES) which are the equivalent of a field ...
Database Design Examples
... 3.) Binary Relationship S between R1 and R2 entity sets. Assume (a1,a2,…an) is the attributes of S. If cardinality is 1-1: Chose either relations( say S) and extend it with {PK(T) U (a1,a2,…an)} If cardinality is 1-N: Chose N-side relation( say S) and extend it with {PK(T) U (a1,a2,…an)} If cardinal ...
... 3.) Binary Relationship S between R1 and R2 entity sets. Assume (a1,a2,…an) is the attributes of S. If cardinality is 1-1: Chose either relations( say S) and extend it with {PK(T) U (a1,a2,…an)} If cardinality is 1-N: Chose N-side relation( say S) and extend it with {PK(T) U (a1,a2,…an)} If cardinal ...
Document
... • Assume relational data model • Replication – System maintains multiple copies of data, stored in different sites, for faster retrieval and fault tolerance. – A relation or fragment of a relation is replicated if it is stored redundantly in two or more sites. – Full replication of a relation is the ...
... • Assume relational data model • Replication – System maintains multiple copies of data, stored in different sites, for faster retrieval and fault tolerance. – A relation or fragment of a relation is replicated if it is stored redundantly in two or more sites. – Full replication of a relation is the ...
14 Databases
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
Chap06
... (Figure 3-21). Emphasize that this E-R diagram must be transformed through logical database design before it can be implemented. Preview the position of logical database design in the overall database development process (see Figure 2-5). You might want to discuss who in the organization is usually ...
... (Figure 3-21). Emphasize that this E-R diagram must be transformed through logical database design before it can be implemented. Preview the position of logical database design in the overall database development process (see Figure 2-5). You might want to discuss who in the organization is usually ...
ch-14 - WordPress.com
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
Document
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
... Tuples. Each row in a relation is called a tuple. A tuple defines a collection of attribute values. The total number of rows in a relation is called the cardinality of the relation. Note that the cardinality of a relation changes when tuples are added or deleted. This makes the database dynamic. ...
IT 244 Database Management System - TIHE
... particular Employee ID value corresponds to one and only one Employee Address value. (Note that the reverse need not be true: several employees could live at the same address and therefore one Employee Address value could correspond to more than one Employee ID. Employee ID is therefore not function ...
... particular Employee ID value corresponds to one and only one Employee Address value. (Note that the reverse need not be true: several employees could live at the same address and therefore one Employee Address value could correspond to more than one Employee ID. Employee ID is therefore not function ...
MayBMS: A Probabilistic Database Management System
... possible Final state using the repair-key construct. We encode it as a U-relation (see R2) that only adds to FT a condition column over independent random variables x, y, and z, which are used to express the correlations created by repair-key: for each Init value, the possible Final values are mutua ...
... possible Final state using the repair-key construct. We encode it as a U-relation (see R2) that only adds to FT a condition column over independent random variables x, y, and z, which are used to express the correlations created by repair-key: for each Init value, the possible Final values are mutua ...
Object-Oriented Methods: Database Technology
... Uniform mode in which real world concepts are represented throughout the system, including the database component simplifies the design and ...
... Uniform mode in which real world concepts are represented throughout the system, including the database component simplifies the design and ...
Some high level language constructs for data of type
... – Allow altering and querying relations – Types can be checked at compile time – User friendly • The user does not program a procedure that produces the result but gives a declaration of certain properties of the result ...
... – Allow altering and querying relations – Types can be checked at compile time – User friendly • The user does not program a procedure that produces the result but gives a declaration of certain properties of the result ...
ppt file
... The Semistructured-Data Model Programming Languages for XML Spring 2011 Instructor: Hassan Khosravi ...
... The Semistructured-Data Model Programming Languages for XML Spring 2011 Instructor: Hassan Khosravi ...
The Importance of Column Names - Department of Computer Science
... Mathematicians deal with ordered n-tuples, and a Cartesian product operator that is non-commutative. Codd saw an improvement on those concepts for database purposes. ...
... Mathematicians deal with ordered n-tuples, and a Cartesian product operator that is non-commutative. Codd saw an improvement on those concepts for database purposes. ...
LECTURE 3 THE RELATIONAL DATABASE MODEL
... associated with two STU_NUM values: 324274 and 324291. In this case, the functional dependence can be defined as ; Attribute A determines attribute B (i.e., B is functionally dependent on A) if all of the rows in the table that agree in value for attribute A also agree in ...
... associated with two STU_NUM values: 324274 and 324291. In this case, the functional dependence can be defined as ; Attribute A determines attribute B (i.e., B is functionally dependent on A) if all of the rows in the table that agree in value for attribute A also agree in ...
Database (1)
... The main objective of this course is to provide students with the theoretical background and practical experience relating to the design and implementation of relational databases.The main objectives of the course are: 1. Learn the fundamental database concepts and systems methodologies to design da ...
... The main objective of this course is to provide students with the theoretical background and practical experience relating to the design and implementation of relational databases.The main objectives of the course are: 1. Learn the fundamental database concepts and systems methodologies to design da ...
Heuristic Optimization of OLAP Queries in Multidimensionally
... lazy grouping and aggregation. These latter transformations postpone the application of a grouping operation until after a join, and may reduce the number of input rows to the group-by, if the join is selective. Both directions of transformation are considered during query optimization. Transformati ...
... lazy grouping and aggregation. These latter transformations postpone the application of a grouping operation until after a join, and may reduce the number of input rows to the group-by, if the join is selective. Both directions of transformation are considered during query optimization. Transformati ...
CSc 460 (Database Design) Module 3 (SQL) Review Fall 2012 1
... 1. Show how the following query (on the WebReg schema) can be expressed in the relational algebra with a semi-join. "List the names of buildings in which sections of computer science courses are held." What about an SQL query suggests that it may be mapped to a semijoin? Illustrate with an SQL query ...
... 1. Show how the following query (on the WebReg schema) can be expressed in the relational algebra with a semi-join. "List the names of buildings in which sections of computer science courses are held." What about an SQL query suggests that it may be mapped to a semijoin? Illustrate with an SQL query ...
Database
... • Data can be accessed from different sites as well as the local site • Although each site has complete control over its local data, there is global control through the internet ...
... • Data can be accessed from different sites as well as the local site • Although each site has complete control over its local data, there is global control through the internet ...
Database
... • Data can be accessed from different sites as well as the local site • Although each site has complete control over its local data, there is global control through the internet ...
... • Data can be accessed from different sites as well as the local site • Although each site has complete control over its local data, there is global control through the internet ...