Database Theory - Binus Repository
... • Internal schema at the internal level to describe data storage structures and access paths. Typically uses a physical data model. • Conceptual schema at the conceptual level to describe the structure and constraints for the whole database. Uses a conceptual or an implementation data model . • Exte ...
... • Internal schema at the internal level to describe data storage structures and access paths. Typically uses a physical data model. • Conceptual schema at the conceptual level to describe the structure and constraints for the whole database. Uses a conceptual or an implementation data model . • Exte ...
JDBC Contents
... o Type 3 drivers provide a client with a generic network API that is then translated into database specific access at the server level. o In other words, the JDBC driver on the client uses sockets to call a middleware application on the server that translates the client requests into an API specific ...
... o Type 3 drivers provide a client with a generic network API that is then translated into database specific access at the server level. o In other words, the JDBC driver on the client uses sockets to call a middleware application on the server that translates the client requests into an API specific ...
COMP5138 Relational Database Management Systems Databases
... – Networks and telecommunications, distributed databases, client-server and 3-tier architectures • Database Applications – Application programs used to perform database activities (create, read, update, and delete) for database users ...
... – Networks and telecommunications, distributed databases, client-server and 3-tier architectures • Database Applications – Application programs used to perform database activities (create, read, update, and delete) for database users ...
marked
... Merge-Join 1. Sort both relations on their join attribute (if not already sorted on the join attributes). 2. Merge the sorted relations to join them 1. Join step is similar to the merge stage of the sort-merge algorithm. 2. Main difference is handling of duplicate values in join attribute — every p ...
... Merge-Join 1. Sort both relations on their join attribute (if not already sorted on the join attributes). 2. Merge the sorted relations to join them 1. Join step is similar to the merge stage of the sort-merge algorithm. 2. Main difference is handling of duplicate values in join attribute — every p ...
CSC 742: Database Management Systems
... Some of the topics are important but are either quite straightforward or not a main focus of this course. These topics will be identified as self-study topics on the course web page. Your knowledge of them will be evaluated as appropriate through exams, homework, programming assignments, or the proj ...
... Some of the topics are important but are either quite straightforward or not a main focus of this course. These topics will be identified as self-study topics on the course web page. Your knowledge of them will be evaluated as appropriate through exams, homework, programming assignments, or the proj ...
database of observational user requirements and observing system
... 3) Development is based on a modular structure, which supports an evolutionary step-by step approach, allowing a standalone version of the requirements part before developing and populating the capabilities part or adding new functionality 4) The database is fully available on-line via the web and u ...
... 3) Development is based on a modular structure, which supports an evolutionary step-by step approach, allowing a standalone version of the requirements part before developing and populating the capabilities part or adding new functionality 4) The database is fully available on-line via the web and u ...
Spatial Query Languages
... ConvexHull: Smallest convex geometric set enclosing the geometry SymmDiff: Return the portions of two geometries that do not intersect with each other ...
... ConvexHull: Smallest convex geometric set enclosing the geometry SymmDiff: Return the portions of two geometries that do not intersect with each other ...
Chapter 23: Advanced Data Types and New Applications
... A node is a leaf node if all the array values in the region that it covers are the same. Otherwise, it is subdivided further into four children of equal area, and is therefore an internal node. Each node corresponds to a sub-array of values. The sub-arrays corresponding to leaves either contai ...
... A node is a leaf node if all the array values in the region that it covers are the same. Otherwise, it is subdivided further into four children of equal area, and is therefore an internal node. Each node corresponds to a sub-array of values. The sub-arrays corresponding to leaves either contai ...
XDWE: A prototype to establish XML as a Native Data Source in
... • To establish XML as a data-source integrated with an WAP-portal. We have developed a prototype for that purpose, named ‘Mobile Xportal’. • Our challenge is to develop a native XML database, in which XML data is stored directly, retaining its natural tree structure. At the same time, we would like ...
... • To establish XML as a data-source integrated with an WAP-portal. We have developed a prototype for that purpose, named ‘Mobile Xportal’. • Our challenge is to develop a native XML database, in which XML data is stored directly, retaining its natural tree structure. At the same time, we would like ...
ppt file - IPFW.edu
... Database Schema – the structure and constraints of the data format defined through Data Definition Language (DDL) Table • Rows - record tuples • Column – data attributes ...
... Database Schema – the structure and constraints of the data format defined through Data Definition Language (DDL) Table • Rows - record tuples • Column – data attributes ...
Overview of In-database Processing
... FIRSTOBS= will prevent in-database processing. Each procedure may also have limitations specific to the procedure. Refer to the SAS documentation for a specific procedure to determine in-database supported statements and options. Although in-database processing may be turned on, if an unsupported st ...
... FIRSTOBS= will prevent in-database processing. Each procedure may also have limitations specific to the procedure. Refer to the SAS documentation for a specific procedure to determine in-database supported statements and options. Although in-database processing may be turned on, if an unsupported st ...
Physical Database Design
... A second table is created since in the conversion of a many-to-many relationship of any degree — unary, binary, or ternary — the number of tables will be equal to the number of entity types (one, two, or three, respectively) plus one more table for the many-to-many ...
... A second table is created since in the conversion of a many-to-many relationship of any degree — unary, binary, or ternary — the number of tables will be equal to the number of entity types (one, two, or three, respectively) plus one more table for the many-to-many ...
Overview
... descendants of USA North West and USA are ancestors of Washington North West and South West are siblings Oregon and California are cousins All are dimension members ...
... descendants of USA North West and USA are ancestors of Washington North West and South West are siblings Oregon and California are cousins All are dimension members ...
Slide 1
... the records and fields for each table Be sure every record has a unique primary key Use separate fields for logically distinct items Do not create fields for information that can be derived from entries in other fields Allow enough space for each field Set default values for frequently ent ...
... the records and fields for each table Be sure every record has a unique primary key Use separate fields for logically distinct items Do not create fields for information that can be derived from entries in other fields Allow enough space for each field Set default values for frequently ent ...
Slide 1
... ● The database may be easily deployed, running either standalone, inside a servlet engine, or directly embedded in an application. ...
... ● The database may be easily deployed, running either standalone, inside a servlet engine, or directly embedded in an application. ...
Physical Database Design
... data is held in each relation. The amount of data in the database will determine how long operations take to perform. 2. The use that will be made of the database. If a database is queried often then it will have to be designed to answer a large number of queries quickly. If data is added to the dat ...
... data is held in each relation. The amount of data in the database will determine how long operations take to perform. 2. The use that will be made of the database. If a database is queried often then it will have to be designed to answer a large number of queries quickly. If data is added to the dat ...
Database Technology Topic 6: Triggers and Stored
... BEFORE trigger activated by attempt to insert or to modify the row, regardless of whether the attempt subsequently succeeds AFTER trigger activated only if the BEFORE trigger (if any) and the row operation both execute successfully If error during either a BEFORE or an AFTER trigger, the entire stat ...
... BEFORE trigger activated by attempt to insert or to modify the row, regardless of whether the attempt subsequently succeeds AFTER trigger activated only if the BEFORE trigger (if any) and the row operation both execute successfully If error during either a BEFORE or an AFTER trigger, the entire stat ...
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.