ppt
... horror movies are preferred to dramas (PG) Attribute preference: the director of a movie is as important as its genre (PDG) PD and PG are combined by taking the pareto preference composition PD⊗PG – PDG expresses that PD and PG are equally important t2 is preferred to t1 and t3 t1, t3 are incomparab ...
... horror movies are preferred to dramas (PG) Attribute preference: the director of a movie is as important as its genre (PDG) PD and PG are combined by taking the pareto preference composition PD⊗PG – PDG expresses that PD and PG are equally important t2 is preferred to t1 and t3 t1, t3 are incomparab ...
Weak Entity Sets
... Form a table for each entity set with all local and inherited attributes table table attributes person name, street, city customer name, street, city, credit-rating employee name, street, city, salary If specialization is total, table for generalized entity (person) not required to store informa ...
... Form a table for each entity set with all local and inherited attributes table table attributes person name, street, city customer name, street, city, credit-rating employee name, street, city, salary If specialization is total, table for generalized entity (person) not required to store informa ...
SQL3 - Computer Science
... explicitly creates a single table in which all instances are stored. Thus, in SQL3 it may not be possible to apply an SQL query to all instances of a given UDT. For example, if we created a second table such as: CREATE TABLE Client ( info PersonType, prefType CHAR, maxRent DECIMAL(6,2), branchNo VAR ...
... explicitly creates a single table in which all instances are stored. Thus, in SQL3 it may not be possible to apply an SQL query to all instances of a given UDT. For example, if we created a second table such as: CREATE TABLE Client ( info PersonType, prefType CHAR, maxRent DECIMAL(6,2), branchNo VAR ...
CS chit-chat - ERI people pages
... • Gazetteer is an instance of a much more general problem • To wit: – how to describe the automatic translation of dynamic queries written in an abstract query language to SQL – in an easy, powerful, flexible way – making as few assumptions as possible about the underlying schema – and producing “re ...
... • Gazetteer is an instance of a much more general problem • To wit: – how to describe the automatic translation of dynamic queries written in an abstract query language to SQL – in an easy, powerful, flexible way – making as few assumptions as possible about the underlying schema – and producing “re ...
IBM Software Technical Document
... The query optimizer can choose to use any number of tasks for either I/O or SMP parallel processing to process the query or database file keyed access path build, rebuild, or maintenance. SMP parallel processing is used only if the system feature, DB2® Symmetric Multiprocessing for OS/400®, is insta ...
... The query optimizer can choose to use any number of tasks for either I/O or SMP parallel processing to process the query or database file keyed access path build, rebuild, or maintenance. SMP parallel processing is used only if the system feature, DB2® Symmetric Multiprocessing for OS/400®, is insta ...
Query From Examples: An Iterative, Data-Driven
... approaches require the users to be familiar with SQL, as they need to be able to read and write SQL queries. In addition, these approaches might not be applicable if the data being queried belongs to a private database that is used only by a single user. In this paper, we propose a new approach, cal ...
... approaches require the users to be familiar with SQL, as they need to be able to read and write SQL queries. In addition, these approaches might not be applicable if the data being queried belongs to a private database that is used only by a single user. In this paper, we propose a new approach, cal ...
A Relational Database Primer for SAS Programmers
... rows, one for each degree that he holds. It has modification anomalies Since if Joe's employer changes we must modify four rows in the table. The problem is that the table contains attributes that do not depend on all ofthe primary key (name and papertitle). Specifically, attributes company and degr ...
... rows, one for each degree that he holds. It has modification anomalies Since if Joe's employer changes we must modify four rows in the table. The problem is that the table contains attributes that do not depend on all ofthe primary key (name and papertitle). Specifically, attributes company and degr ...
SQL Standard
... SQL: 2003 is modified-enhanced version of SQL: 1999 and it is popularly believed to be largely a “bug-fix release” of the SQL standard. ...
... SQL: 2003 is modified-enhanced version of SQL: 1999 and it is popularly believed to be largely a “bug-fix release” of the SQL standard. ...
Sybase ASE - Surya Prakash
... The values keyword specifies values for some or all of the columns in a new row. A simplified version of the syntax for the insert command using the values keyword is: ...
... The values keyword specifies values for some or all of the columns in a new row. A simplified version of the syntax for the insert command using the values keyword is: ...
A Bootstrapping Architecture for Integration of Relational Databases to the Semantic Web
... the relational schema and the existing ontology is a programming process, which is not attractive for users who want a simple way of exposing their relational content on the Semantic Web. On the other hand, Direct Mapping methods offer an automatic method of exposing relational content to the Semant ...
... the relational schema and the existing ontology is a programming process, which is not attractive for users who want a simple way of exposing their relational content on the Semantic Web. On the other hand, Direct Mapping methods offer an automatic method of exposing relational content to the Semant ...
CSS122_WINTER09_LECTURE08
... As in the previous example, subqueries in the INSERT command work, but only if the update table and the subquery table are different. This rule only applies to MySQL, other database ...
... As in the previous example, subqueries in the INSERT command work, but only if the update table and the subquery table are different. This rule only applies to MySQL, other database ...
Ch3_RM - Fordham University Computer and Information
... Option 1: Delete/Update all Enrolled rows that refer to the deleted sid in Students (CASCADE). Both are affected Option 2: Reject the deletion/updating of the Students row if an Enrolled row refers to it (NO ACTION ). [The default action for SQL]. None is affected. Option 3: Set the sid of Enr ...
... Option 1: Delete/Update all Enrolled rows that refer to the deleted sid in Students (CASCADE). Both are affected Option 2: Reject the deletion/updating of the Students row if an Enrolled row refers to it (NO ACTION ). [The default action for SQL]. None is affected. Option 3: Set the sid of Enr ...
Slide 1
... running either standalone, inside a servlet engine, or directly embedded in an application. ...
... running either standalone, inside a servlet engine, or directly embedded in an application. ...
