Set Predicates in SQL: Enabling Set
... The algorithm builds an inverted for the container relation S and uses it to process the join. We demonstrate the efficiency and robustness of this method under various experimental settings. We discuss and validate the efficient processing of other join predicates, namely set equality and set over ...
... The algorithm builds an inverted for the container relation S and uses it to process the join. We demonstrate the efficiency and robustness of this method under various experimental settings. We discuss and validate the efficient processing of other join predicates, namely set equality and set over ...
Chapter 5
... A set S of relation schemas that belong to the same database. S is the name of the whole database schema S = {R1, R2, ..., Rn} R1, R2, …, Rn are the names of the individual relation schemas within the database S ...
... A set S of relation schemas that belong to the same database. S is the name of the whole database schema S = {R1, R2, ..., Rn} R1, R2, …, Rn are the names of the individual relation schemas within the database S ...
Revision Lecture - Homepages | The University of Aberdeen
... – You should know how to use common DML/DDL/DCL statements, especially SELECT, and be able to say what most other statements do... • For a “pass” you just need to learn SELECT statements in all its forms • For a “first” you should learn all the SQL statements ...
... – You should know how to use common DML/DDL/DCL statements, especially SELECT, and be able to say what most other statements do... • For a “pass” you just need to learn SELECT statements in all its forms • For a “first” you should learn all the SQL statements ...
DS_13_olap
... baskets = sets of “items” that are purchased together as a customer leaves a store. Summary of basket data is frequent itemsets = sets of items that often appear together in baskets. ...
... baskets = sets of “items” that are purchased together as a customer leaves a store. Summary of basket data is frequent itemsets = sets of items that often appear together in baskets. ...
Lecture 14- Parallel Databases
... Pi stores the tuples it received temporarily on disk Di. This step requires I/O and communication overhead. Each processor Pi sorts its partition of the relation locally. Each processors executes same operation (sort) in parallel with other processors, without any interaction with the others (data p ...
... Pi stores the tuples it received temporarily on disk Di. This step requires I/O and communication overhead. Each processor Pi sorts its partition of the relation locally. Each processors executes same operation (sort) in parallel with other processors, without any interaction with the others (data p ...
Lecture 14- Parallel Databases
... If a relation consists of m disk blocks and there are n disks available in the system, then the relation should be allocated min(m,n) disks. ...
... If a relation consists of m disk blocks and there are n disks available in the system, then the relation should be allocated min(m,n) disks. ...
eXtensible Relational Databases
... reconciles all relevant relations, attributes, and constraints of interest to the federation from the interoperating data sources. Aside from being time-consuming to produce, mediated schemas thus created are not easily adaptable to changes in the underlying sources, nor can they be easily extended ...
... reconciles all relevant relations, attributes, and constraints of interest to the federation from the interoperating data sources. Aside from being time-consuming to produce, mediated schemas thus created are not easily adaptable to changes in the underlying sources, nor can they be easily extended ...
A 1
... The Relational Database Concept Data appears to be stored in what we have been referring to as simple, linear files. Relational databases are based on mathematics. A relational database is a collection of relations that, as a group, contain the data that describes a particular business enviro ...
... The Relational Database Concept Data appears to be stored in what we have been referring to as simple, linear files. Relational databases are based on mathematics. A relational database is a collection of relations that, as a group, contain the data that describes a particular business enviro ...
OODB - Personal.psu.edu
... Designer can specify the structure of objects and their behavior (methods) Better interaction with object-oriented languages such as Java and C++ Definition of complex and user-defined types Encapsulation of operations and user-defined methods ...
... Designer can specify the structure of objects and their behavior (methods) Better interaction with object-oriented languages such as Java and C++ Definition of complex and user-defined types Encapsulation of operations and user-defined methods ...
Slide 5-9
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra Important distinction between SQL and the formal relational model; SQL allows a table (relation) to have two or more tuples that are ide ...
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra Important distinction between SQL and the formal relational model; SQL allows a table (relation) to have two or more tuples that are ide ...
Data Definition: Creating a Relation
... Modifies a tuple or tuples of a relation Don’t violate constraints as long as the modified attributes are not primary keys or foreign keys Update of a primary key corresponds to a deletion followed by an insertion Update of a foreign key attribute is legal only if the new value corresponds to an exi ...
... Modifies a tuple or tuples of a relation Don’t violate constraints as long as the modified attributes are not primary keys or foreign keys Update of a primary key corresponds to a deletion followed by an insertion Update of a foreign key attribute is legal only if the new value corresponds to an exi ...
Data Definition: Creating a Relation
... Modifies a tuple or tuples of a relation Don’t violate constraints as long as the modified attributes are not primary keys or foreign keys Update of a primary key corresponds to a deletion followed by an insertion Update of a foreign key attribute is legal only if the new value corresponds to an exi ...
... Modifies a tuple or tuples of a relation Don’t violate constraints as long as the modified attributes are not primary keys or foreign keys Update of a primary key corresponds to a deletion followed by an insertion Update of a foreign key attribute is legal only if the new value corresponds to an exi ...
Languages of DBMS Data Definition, Relational
... Grant can be attached to any combination of select, insert, update, delete, alter Restricting access to parts pf a table can be effected by using the view and grant commands Privileges can be withdrawn with the revoke command ...
... Grant can be attached to any combination of select, insert, update, delete, alter Restricting access to parts pf a table can be effected by using the view and grant commands Privileges can be withdrawn with the revoke command ...
Probabilistic Data Management
... • Join/merge two relations • Remove duplicates from a single relation • Validate incoming tuples against a “reference set” ...
... • Join/merge two relations • Remove duplicates from a single relation • Validate incoming tuples against a “reference set” ...
Introduction to Database Systems - Chen Li -
... If so, this is a participation constraint: the participation of Departments in Manages is said to be total (vs. partial). • Every Departments entity below must appear in an instance of the Manages relationship • Ditto for both Employees and Departments for Works_In since ...
... If so, this is a participation constraint: the participation of Departments in Manages is said to be total (vs. partial). • Every Departments entity below must appear in an instance of the Manages relationship • Ditto for both Employees and Departments for Works_In since ...
Relational database schema and MS Access
... Doesn’t have hidden pointers to connect entities - just uses data Any entity can be connected to any other entity by using data ...
... Doesn’t have hidden pointers to connect entities - just uses data Any entity can be connected to any other entity by using data ...
Conceptual and Logical Database Design
... • Conceptual database design – Constructing an information model, independent from all physical consideration for an enterprise ...
... • Conceptual database design – Constructing an information model, independent from all physical consideration for an enterprise ...
Chapter4a
... Cross-product ( ) Allows us to combine two relations. Set-difference ( ) Tuples in reln. 1, but not in reln. 2. Union ( ) Tuples in reln. 1 and in reln. 2. ...
... Cross-product ( ) Allows us to combine two relations. Set-difference ( ) Tuples in reln. 1, but not in reln. 2. Union ( ) Tuples in reln. 1 and in reln. 2. ...
Implementation of Database Management Systems
... primary key and foreign key constraint (primary key have to be implemented for one or more columns, but foreign key is optional to implement for more than one column), index definition commands and catalog management. For primary key you will create index file automatic. The System Management compon ...
... primary key and foreign key constraint (primary key have to be implemented for one or more columns, but foreign key is optional to implement for more than one column), index definition commands and catalog management. For primary key you will create index file automatic. The System Management compon ...
CH8 Br
... Dynamic result of one or more relational operations operating on the base relations to produce another relation. • A view is a virtual relation that does not actually exist in the database but is produced upon request, at time of request. • Contents of a view are defined as a query on one or more ba ...
... Dynamic result of one or more relational operations operating on the base relations to produce another relation. • A view is a virtual relation that does not actually exist in the database but is produced upon request, at time of request. • Contents of a view are defined as a query on one or more ba ...
Chapter 43 – Relational databases
... Suggest foreign keys that could be used to create the relationships. Client ID and Engineer ID Identify four other attributes that the company may store. Client’s details such as company name, address, contact details, make of copier. Engineer details such as name and address. Job details, such as t ...
... Suggest foreign keys that could be used to create the relationships. Client ID and Engineer ID Identify four other attributes that the company may store. Client’s details such as company name, address, contact details, make of copier. Engineer details such as name and address. Job details, such as t ...
The Entity-Relationship Model
... If all students assigned to an advisor graduate, information about the advisor will disappear from the database. ...
... If all students assigned to an advisor graduate, information about the advisor will disappear from the database. ...
Introduction to Databases
... The candidate key that is chosen to perform the identification task is called the primary key and the remaining candidate keys are known as alternate keys. No of Alternate Keys = No of Candidate Keys - 1 ...
... The candidate key that is chosen to perform the identification task is called the primary key and the remaining candidate keys are known as alternate keys. No of Alternate Keys = No of Candidate Keys - 1 ...