CH06
... A query that is part of another is called a subquery. A number of ways that subqueries can be used: 1) Subqueries can return a single constant, and this constant can be compared with another value in a WHERE clause. 2) Subqueries can return relations that can be used in various way in WHERE clau ...
... A query that is part of another is called a subquery. A number of ways that subqueries can be used: 1) Subqueries can return a single constant, and this constant can be compared with another value in a WHERE clause. 2) Subqueries can return relations that can be used in various way in WHERE clau ...
IT 244 Database Management System - TIHE
... Address has a functional dependency on Employee ID, because a particular Employee ID value corresponds to one and only one Employee Address value. (Note that the reverse need not be true: several employees could live at the same address and therefore one Employee Address value could correspond to mo ...
... Address has a functional dependency on Employee ID, because a particular Employee ID value corresponds to one and only one Employee Address value. (Note that the reverse need not be true: several employees could live at the same address and therefore one Employee Address value could correspond to mo ...
SQL: Creating and Modifying Database Tables
... Data in relational database tables are inserted, retrieved, modified and deleted using commands called queries. Queries are usually described by a language called SQL (which stands for Standard Query Language). [note: SQL is pronounced 'Sequel' to rhyme with equal] SQL is clearly the standard when i ...
... Data in relational database tables are inserted, retrieved, modified and deleted using commands called queries. Queries are usually described by a language called SQL (which stands for Standard Query Language). [note: SQL is pronounced 'Sequel' to rhyme with equal] SQL is clearly the standard when i ...
Chapter 19. Special Topics
... Read authorization - allows reading, but not modification of data. Insert authorization - allows insertion of new data, but not ...
... Read authorization - allows reading, but not modification of data. Insert authorization - allows insertion of new data, but not ...
Database_performance
... access data from both the table and an index on that table. If both of these files reside on the same disk device, performance degradation is likely. • To retrieve data from disk, an arm moves over the surface of the disk to read physical blocks of data on the disk. If a single operation is accessin ...
... access data from both the table and an index on that table. If both of these files reside on the same disk device, performance degradation is likely. • To retrieve data from disk, an arm moves over the surface of the disk to read physical blocks of data on the disk. If a single operation is accessin ...
Data Sheet
... gains in application performance. With TimesTen Cache, a transaction that reads a database record can take less than 3 microseconds (a microsecond is one millionth of a second), and transactions that update or insert a record can take about 7 microseconds (measured with Oracle Linux running on Intel ...
... gains in application performance. With TimesTen Cache, a transaction that reads a database record can take less than 3 microseconds (a microsecond is one millionth of a second), and transactions that update or insert a record can take about 7 microseconds (measured with Oracle Linux running on Intel ...
Using R with databases
... in 1993. They wanted to design a language that would help them teach introductory statistics to their students. The design of R was influenced by an existing language called S, from Bell Labs, which was created in the 1970s. R is considered a domain specific language because it was designed primaril ...
... in 1993. They wanted to design a language that would help them teach introductory statistics to their students. The design of R was influenced by an existing language called S, from Bell Labs, which was created in the 1970s. R is considered a domain specific language because it was designed primaril ...
Client/Server Computing (the wave of the future)
... subsystem and pass the data over the network Requires many slots for network connections and a large-capacity, fast hard disk subsystem. ...
... subsystem and pass the data over the network Requires many slots for network connections and a large-capacity, fast hard disk subsystem. ...
database
... database should be related to one another. The easiest time to change the database structure is during the data modeling stage. However, once the database has been constructed, loaded with data, and application forms, reports, queries, and application programs created, changing a relationship means ...
... database should be related to one another. The easiest time to change the database structure is during the data modeling stage. However, once the database has been constructed, loaded with data, and application forms, reports, queries, and application programs created, changing a relationship means ...
- bYTEBoss
... it by decomposing it into two or more smaller relation schemas that are in the normal form. Decomposition has to be used carefully, since there are potential problems. What are desirable properties of a decomposition, and how to test them? How to obtain a decomposition with some desirable prop ...
... it by decomposing it into two or more smaller relation schemas that are in the normal form. Decomposition has to be used carefully, since there are potential problems. What are desirable properties of a decomposition, and how to test them? How to obtain a decomposition with some desirable prop ...
An Android Studio SQLite Database Tutorial
... Once completed, the application will consist of an activity and a database handler class. The database handler will be a subclass of SQLiteOpenHelper and will provide an abstract layer between the underlying SQLite database and the activity class, with the activity calling on the database handler to ...
... Once completed, the application will consist of an activity and a database handler class. The database handler will be a subclass of SQLiteOpenHelper and will provide an abstract layer between the underlying SQLite database and the activity class, with the activity calling on the database handler to ...
Sorting a Database
... Connectors — Words such as AND, OR and NOT that join certain conditions together when performing a search. Currency — A numeric type which add a $ sign to number. Database - An organized collection of information. Database Management System — Software that allows the computer to create a database; a ...
... Connectors — Words such as AND, OR and NOT that join certain conditions together when performing a search. Currency — A numeric type which add a $ sign to number. Database - An organized collection of information. Database Management System — Software that allows the computer to create a database; a ...
Section 0: Introduction
... Questions Considered 1.Semantics: how do you interpret a relational/first-order ...
... Questions Considered 1.Semantics: how do you interpret a relational/first-order ...
lis651p05a-02
... that is the result row for the resource resource representing the most recent, or NULL if it the last result is reached. Its results in an array that contains the columns requested both by number and by column name: while($columns=mysqli_fetch_array($result)) { print 'name: '.$columns['name']; print ...
... that is the result row for the resource resource representing the most recent, or NULL if it the last result is reached. Its results in an array that contains the columns requested both by number and by column name: while($columns=mysqli_fetch_array($result)) { print 'name: '.$columns['name']; print ...
Relationship Sets
... Relationship sets may involve more than two entity sets. E.g. Suppose employees of a bank may have jobs (responsibilities) at multiple branches, with different jobs at different branches. Then there is a ternary relationship set between entity sets employee, job and branch ...
... Relationship sets may involve more than two entity sets. E.g. Suppose employees of a bank may have jobs (responsibilities) at multiple branches, with different jobs at different branches. Then there is a ternary relationship set between entity sets employee, job and branch ...
Using OGC Services to Interoperate Spatial Data Stored in SQL and
... [Havlik et al. 2009]. In this project, a service was designed to provide a single point of access to data spread across the various nodes of a network of sensors. However, this service only supports data provided by the standard Sensor Observation Service 8. On the other hand, the ORCHESTRA project ...
... [Havlik et al. 2009]. In this project, a service was designed to provide a single point of access to data spread across the various nodes of a network of sensors. However, this service only supports data provided by the standard Sensor Observation Service 8. On the other hand, the ORCHESTRA project ...
Getting Started with Oracle Server
... When redo log buffer is 1/3 full When there is more than 1 MB of changes Before DBWR (DB Writer) completes cleaning modified buffer blocks in the buffer cache by writing them to the data files - When a timeout occurs (every 3 seconds) ...
... When redo log buffer is 1/3 full When there is more than 1 MB of changes Before DBWR (DB Writer) completes cleaning modified buffer blocks in the buffer cache by writing them to the data files - When a timeout occurs (every 3 seconds) ...
DATABASE SYSTEMS
... • Also a relationship type can have attributes. E.g. in the case where the weekly number of hours an employee works on a project should be kept, that can be represented for each instance of the relation “works-on”. • If the relation is a 1:1 or 1:N relation, the attribute can be stored at one of the ...
... • Also a relationship type can have attributes. E.g. in the case where the weekly number of hours an employee works on a project should be kept, that can be represented for each instance of the relation “works-on”. • If the relation is a 1:1 or 1:N relation, the attribute can be stored at one of the ...
account-number - UCLA Computer Science
... insert into borrower (select customer-name,account-number from depositor, inserted where inserted.account-number = depositor.account-number) insert into loan values (inserted.account-number, inserted.branch-name, – inserted.balance) update account set balance = 0 from account, inserted where account ...
... insert into borrower (select customer-name,account-number from depositor, inserted where inserted.account-number = depositor.account-number) insert into loan values (inserted.account-number, inserted.branch-name, – inserted.balance) update account set balance = 0 from account, inserted where account ...
ppt
... • Up to 1970, a “database” was a file of records – COBOL/CODASYL – Network model, with low level navigational interface ...
... • Up to 1970, a “database” was a file of records – COBOL/CODASYL – Network model, with low level navigational interface ...
MCITP Administrator: Microsoft SQL Server 2005 Database
... • Once invoked, permissions remain the same as long as the session is active. © Wiley Inc. 2006. All Rights Reserved. ...
... • Once invoked, permissions remain the same as long as the session is active. © Wiley Inc. 2006. All Rights Reserved. ...
