Open Source Databases and GIS
... PHP/Mapscript and PHP/PgSQL to build interactive web mapping applications ArcIMS emulator with Mapserver to view PostGIS data within Arc8 ...
... PHP/Mapscript and PHP/PgSQL to build interactive web mapping applications ArcIMS emulator with Mapserver to view PostGIS data within Arc8 ...
Select - FSU Computer Science Department
... Based on transitive dependency, or nonkey dependency A functional dependency X-->Y is a transitive dependency if there is a set Z which is not a subset of any key, and for which X-->Z and Z->Y A relation schema is in 3NF if there is no nonprime attribute which is functionally dependent on a non-key ...
... Based on transitive dependency, or nonkey dependency A functional dependency X-->Y is a transitive dependency if there is a set Z which is not a subset of any key, and for which X-->Z and Z->Y A relation schema is in 3NF if there is no nonprime attribute which is functionally dependent on a non-key ...
Set 1 - Introduction
... data model: way of declaring types and relating them to each other, stored in a schema languages: for creating, deleting and updating tuples/objects for querying -- usually now high-level, ad-hoc queries; can be interactive or embedded in programs persistence: the data exists after the program that ...
... data model: way of declaring types and relating them to each other, stored in a schema languages: for creating, deleting and updating tuples/objects for querying -- usually now high-level, ad-hoc queries; can be interactive or embedded in programs persistence: the data exists after the program that ...
Representing Entity Sets as Tables
... If specialization is total, table for generalized entity (person) not required to store information Can be defined as a “view” relation containing union of specialization tables Drawback: street and city may be stored redundantly for persons who are both customers and employees ...
... If specialization is total, table for generalized entity (person) not required to store information Can be defined as a “view” relation containing union of specialization tables Drawback: street and city may be stored redundantly for persons who are both customers and employees ...
Module Descriptor 2014/15 School of Computer Science and Statistics.
... policies, integration of databases on the web and emerging database technologies. From an information designer’s perspective, the course examines the theoretical model underpinning relational databases, functional dependency theory and normalisation (for information modelling), functional dependency ...
... policies, integration of databases on the web and emerging database technologies. From an information designer’s perspective, the course examines the theoretical model underpinning relational databases, functional dependency theory and normalisation (for information modelling), functional dependency ...
Overview of Databases and Transaction Processing What is a
... Creates the abstraction of a transaction, analogous to the way an operating system creates the abstraction of a process TP monitor and DBMS together guarantee the special properties of transactions ...
... Creates the abstraction of a transaction, analogous to the way an operating system creates the abstraction of a process TP monitor and DBMS together guarantee the special properties of transactions ...
Database Systems The Worlds of Database Systems
... efficient access to large amounts of data, which persists over time. It is also characterized by support for powerful query languages and for durable transactions that can execute concurrently in a manner that appears atomic and independent of other transactions. Comparison With File Systems: Conven ...
... efficient access to large amounts of data, which persists over time. It is also characterized by support for powerful query languages and for durable transactions that can execute concurrently in a manner that appears atomic and independent of other transactions. Comparison With File Systems: Conven ...
lect24
... current and historical data to identify useful patterns and support business strategies. Emphasis is on complex, interactive, exploratory analysis of very large datasets created by integrating data from across all parts of an enterprise; data is fairly static. ...
... current and historical data to identify useful patterns and support business strategies. Emphasis is on complex, interactive, exploratory analysis of very large datasets created by integrating data from across all parts of an enterprise; data is fairly static. ...
chapter01_rev
... File structures and proprietary program interfaces Networks and hierarchies of related records, standard program interfaces Non-procedural languages, optimization, transaction processing Multi-media, active, distributed processing, XML enabled ...
... File structures and proprietary program interfaces Networks and hierarchies of related records, standard program interfaces Non-procedural languages, optimization, transaction processing Multi-media, active, distributed processing, XML enabled ...
How to maximize use of MS Access in research studies
... Interim data analysis -- reports Monthly Report by Gender ...
... Interim data analysis -- reports Monthly Report by Gender ...
Database Version Control via Toad
... database to be out of compliance with its specification. One could argue that the latter scenario would unlikely happen in a well controlled production environment – however sometimes even the best run shops can experience this. Being able to catch this – and then to quickly and accurately restore t ...
... database to be out of compliance with its specification. One could argue that the latter scenario would unlikely happen in a well controlled production environment – however sometimes even the best run shops can experience this. Being able to catch this – and then to quickly and accurately restore t ...
Document
... Electronic databases can save time and help user’s prepare, manipulate, organize, and disseminate data that answers questions and solves information processing problems. The database’s ability to compile, manipulate, and store large quantities of information in short time periods makes it a viable a ...
... Electronic databases can save time and help user’s prepare, manipulate, organize, and disseminate data that answers questions and solves information processing problems. The database’s ability to compile, manipulate, and store large quantities of information in short time periods makes it a viable a ...
Chapter 7 Managing Data Resources
... learn more about their customers. Because of better information, managers are making better decisions and sharpening their focus on profitable and unprofitable customers (see its benefits). Data Mining using datamining, a digital firm can get more information than ever before from its data. Uses a v ...
... learn more about their customers. Because of better information, managers are making better decisions and sharpening their focus on profitable and unprofitable customers (see its benefits). Data Mining using datamining, a digital firm can get more information than ever before from its data. Uses a v ...
Database
... • Information is not useful if not organized • In database, data are organized in a way that people find meaningful and useful. • Database Management System (DBMS) is used to input, sort, organize and store data. ...
... • Information is not useful if not organized • In database, data are organized in a way that people find meaningful and useful. • Database Management System (DBMS) is used to input, sort, organize and store data. ...
notes #3
... changes in the internal schema. – Internal schema changes (e.g. using different file organizations, storage structures/devices) should not require change to conceptual or external schemas. ...
... changes in the internal schema. – Internal schema changes (e.g. using different file organizations, storage structures/devices) should not require change to conceptual or external schemas. ...
Database
... • Information is not useful if not organized • In database, data are organized in a way that people find meaningful and useful. • Database Management System (DBMS) is used to input, sort, organize and store data. ...
... • Information is not useful if not organized • In database, data are organized in a way that people find meaningful and useful. • Database Management System (DBMS) is used to input, sort, organize and store data. ...
Spatial Database Systems
... A spatial database is a database that is enhanced to store and access spatial data or data that defines a geometric space. Data on spatial databases are stored as coordinates, points, lines, polygons and topology. Spatial RDBMS allows to use SQL data types, such as int and varchar, as well as spatia ...
... A spatial database is a database that is enhanced to store and access spatial data or data that defines a geometric space. Data on spatial databases are stored as coordinates, points, lines, polygons and topology. Spatial RDBMS allows to use SQL data types, such as int and varchar, as well as spatia ...
Education
... internal-links between different elements in the same XML document using the ID/IDREF attributes. The rise in popularity of XML has generated much interest in query processing over graphstructured data. In order to facilitate efficient evaluation of path expressions, structured indexes have been pro ...
... internal-links between different elements in the same XML document using the ID/IDREF attributes. The rise in popularity of XML has generated much interest in query processing over graphstructured data. In order to facilitate efficient evaluation of path expressions, structured indexes have been pro ...
Database Management Systems Chapter 1 What Is a Database
... Data Models A data model is a collection of concepts for describing data. A schema is a description of a particular collection of data, using the given data model. The relational model of data is the most widely used model today. ...
... Data Models A data model is a collection of concepts for describing data. A schema is a description of a particular collection of data, using the given data model. The relational model of data is the most widely used model today. ...
Apoorv Kumar and Apul
... Relational model is a collection of tables representing an E‐R database schema. For each entity set and for each relationship set in the database, there is a unique table having the name of the corresponding entity set or relationship set. Each table has multiple columns which correspond to attrib ...
... Relational model is a collection of tables representing an E‐R database schema. For each entity set and for each relationship set in the database, there is a unique table having the name of the corresponding entity set or relationship set. Each table has multiple columns which correspond to attrib ...
Document
... higher level is called Data independence. There are two Levels of data independence: 1.Physical Data Independence: The ability to change the physical schema without changing the logical schema is called physical data independence. For example, a change to the internal schema, such as using differe ...
... higher level is called Data independence. There are two Levels of data independence: 1.Physical Data Independence: The ability to change the physical schema without changing the logical schema is called physical data independence. For example, a change to the internal schema, such as using differe ...