Logical Data Modelling
... Data Access • Data is retrieved by reference to name (of an Attribute) & value (held in a Data Cell) only. • Most important Attribute(s) is know as the ‘Key’, of which there are two types. – Primary Key: • special Attribute(s) used to control access to Tuples (i.e. rows) of data. ...
... Data Access • Data is retrieved by reference to name (of an Attribute) & value (held in a Data Cell) only. • Most important Attribute(s) is know as the ‘Key’, of which there are two types. – Primary Key: • special Attribute(s) used to control access to Tuples (i.e. rows) of data. ...
Document
... The DROP TABLE command deletes all information about the dropped relation from the database The ALTER TABLE command is used to add attributes to or remove attributes from an existing relation (table): ...
... The DROP TABLE command deletes all information about the dropped relation from the database The ALTER TABLE command is used to add attributes to or remove attributes from an existing relation (table): ...
slides - the David R. Cheriton School of Computer Science
... Course Objectives • To study databases from three viewpoints: • the database user, • the database designer, • the database manager. ...
... Course Objectives • To study databases from three viewpoints: • the database user, • the database designer, • the database manager. ...
databaseR - File Storage
... We often create reports that are the result of queries we made Access allows you to create board room quality reports ...
... We often create reports that are the result of queries we made Access allows you to create board room quality reports ...
cmps342_database_systems
... DBMS functions; database architecture and data independence Data modeling (IM3): Data modeling; conceptual models; object-oriented model; relational data model Relational databases (IM4 & IM6): Mapping conceptual schema to a relational schema; Entity and referential integrity; Relational algebra and ...
... DBMS functions; database architecture and data independence Data modeling (IM3): Data modeling; conceptual models; object-oriented model; relational data model Relational databases (IM4 & IM6): Mapping conceptual schema to a relational schema; Entity and referential integrity; Relational algebra and ...
Introduction to Data mining - O6U E
... Homework assignments are an important part of the class, and should be completed on time. Late assignments will be penalized. Homework assignments may take several forms: problem sets, short write-ups of supplemental readings, and in-class presentations. There may be several quizzes during the semes ...
... Homework assignments are an important part of the class, and should be completed on time. Late assignments will be penalized. Homework assignments may take several forms: problem sets, short write-ups of supplemental readings, and in-class presentations. There may be several quizzes during the semes ...
Syllabus of the Entrance Exam
... The syllabus of the entrance exam consists of three parts. The exam test covers all three parts. One task of the exam test is related to one or more topics of the syllabus. The recommended literature is presented for every part of the syllabus, but candidates could use some other literature while pr ...
... The syllabus of the entrance exam consists of three parts. The exam test covers all three parts. One task of the exam test is related to one or more topics of the syllabus. The recommended literature is presented for every part of the syllabus, but candidates could use some other literature while pr ...
DATABASE PROGRAMS
... compatibility with other Microsoft products and to include the Access Basic programming language. ...
... compatibility with other Microsoft products and to include the Access Basic programming language. ...
Data Warehouse performance and maintenance
... And they claim that there has been no change in their system. How can this happen ? One of the reasons is that SQL server is not processing all the operations in the most efficient way. When you run a report, One Stop Reporting sends a set of SQL commands to SQL server and process them in the order ...
... And they claim that there has been no change in their system. How can this happen ? One of the reasons is that SQL server is not processing all the operations in the most efficient way. When you run a report, One Stop Reporting sends a set of SQL commands to SQL server and process them in the order ...
DatabaseSpy Multi-database Tool
... Altova® DatabaseSpy® 2017 is the award-winning multi-database query, design, and comparison tool from the creator of XMLSpy®. Quickly examine or update content or structure, even in unfamiliar databases, without hand-writing SQL queries. Features like table browsing, data editing, SQL auto-completio ...
... Altova® DatabaseSpy® 2017 is the award-winning multi-database query, design, and comparison tool from the creator of XMLSpy®. Quickly examine or update content or structure, even in unfamiliar databases, without hand-writing SQL queries. Features like table browsing, data editing, SQL auto-completio ...
Database model
... an entire database, used by database software to maintain the database Subschema = a description of only that portion of the database pertinent to a particular user’s needs, used to prevent sensitive data from being accessed by ...
... an entire database, used by database software to maintain the database Subschema = a description of only that portion of the database pertinent to a particular user’s needs, used to prevent sensitive data from being accessed by ...
Day 40
... Section 1: Ull 009 Section 2: Ull 206 100 Points – 50 points on design – 50 points on SQL • Open Book/Note/Computer • Do it yourself ...
... Section 1: Ull 009 Section 2: Ull 206 100 Points – 50 points on design – 50 points on SQL • Open Book/Note/Computer • Do it yourself ...
Structured Query Language (SQL)
... – If products support the same interface then customers can focus on the implementation that best meets their own needs without having to choose among different interfaces. ...
... – If products support the same interface then customers can focus on the implementation that best meets their own needs without having to choose among different interfaces. ...
Introducation to MS Access Basics
... Database: Collection of tables and queries Table (or relational table) Collection of records that share a common fundamental characteristic Record A record is composed of fields Query Set of instructions to a database “engine” to retrieve, sort and format returning data. “find me the # of ho ...
... Database: Collection of tables and queries Table (or relational table) Collection of records that share a common fundamental characteristic Record A record is composed of fields Query Set of instructions to a database “engine” to retrieve, sort and format returning data. “find me the # of ho ...
Genome Wide Visualization and Integration
... C. J. DATE, An Introduction to Database Systems, Addison-Wesley 8th Edition (2003) ...
... C. J. DATE, An Introduction to Database Systems, Addison-Wesley 8th Edition (2003) ...
File and Database Design
... A group of fields (or attributes) stored in adjacent memory locations and retrieved together as a unit. ...
... A group of fields (or attributes) stored in adjacent memory locations and retrieved together as a unit. ...
Advanced Database Systems
... Multiple file formats, duplication of information in different files ...
... Multiple file formats, duplication of information in different files ...
Attribute Data and Relational Database Management Systems
... Rule 3: Systematic treatment of null values: The DBMS must allow each field to remain null (or empty). Specifically, it must support a representation of "missing information and inapplicable information" that is systematic, distinct from all regular values (for example, "distinct from zero or any o ...
... Rule 3: Systematic treatment of null values: The DBMS must allow each field to remain null (or empty). Specifically, it must support a representation of "missing information and inapplicable information" that is systematic, distinct from all regular values (for example, "distinct from zero or any o ...
Effective Keyword-Based Selection of Relational Databases
... in a relational database at each distance construct the Wd matrices – the frequencies of keyword pairs at distance d; Example: Figure 3 ...
... in a relational database at each distance construct the Wd matrices – the frequencies of keyword pairs at distance d; Example: Figure 3 ...
SQL
... What makes SQL so popular? • Worldwide language of choice for DBMS • Ease of use / English keyword-oriented ...
... What makes SQL so popular? • Worldwide language of choice for DBMS • Ease of use / English keyword-oriented ...
No Slide Title
... • A database is a collection of data. • Databases can be stored in one or more files, or can be managed by a software system called Database Management System (DBMS) ...
... • A database is a collection of data. • Databases can be stored in one or more files, or can be managed by a software system called Database Management System (DBMS) ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.