Chapter 6: Integrity Constraints
... • If there is a chain of foreign-key dependencies across multiple relations, with on delete cascade specified for each dependency, a deletion or update at one end of the chain can propagate across the entire chain. • If a cascading update or delete causes a constraint violation that cannot be handle ...
... • If there is a chain of foreign-key dependencies across multiple relations, with on delete cascade specified for each dependency, a deletion or update at one end of the chain can propagate across the entire chain. • If a cascading update or delete causes a constraint violation that cannot be handle ...
UIC
... 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.account-number = inserted.account-number end ...
... 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.account-number = inserted.account-number end ...
FROM EMPLOYEE
... Structured Query Language • Structured Query Language – Acronym: SQL – Pronounced as “S-Q-L” [“Ess-Que-El”] – Originally developed by IBM as the SEQUEL language in the 1970s – SQL-92 is an ANSI national standard ...
... Structured Query Language • Structured Query Language – Acronym: SQL – Pronounced as “S-Q-L” [“Ess-Que-El”] – Originally developed by IBM as the SEQUEL language in the 1970s – SQL-92 is an ANSI national standard ...
D.B.M.S Questions
... into DBMS -specific calls. As the DBMS, which is access ed by an application, is known onl y at run time. So the drivers are loaded dynamicall y on demand. Available drivers are registered with a driver manager. The Oracle database driver translates the SQL commands from the application into equival ...
... into DBMS -specific calls. As the DBMS, which is access ed by an application, is known onl y at run time. So the drivers are loaded dynamicall y on demand. Available drivers are registered with a driver manager. The Oracle database driver translates the SQL commands from the application into equival ...
Chapter 8 - cda college
... • Updatable view is a view that can be used to update attributes in the base tables • Not all views are updatable – GROUP BY expressions or aggregate functions cannot be used – Cannot use set operators – Most restrictions are based on use of JOINs Database Systems, 9th Edition ...
... • Updatable view is a view that can be used to update attributes in the base tables • Not all views are updatable – GROUP BY expressions or aggregate functions cannot be used – Cannot use set operators – Most restrictions are based on use of JOINs Database Systems, 9th Edition ...
Dynamic Query Forms for Database Queries
... attributes. Traditional predefined query forms are not able to satisfy various ad-hoc queries from users on those databases. This paper proposes dqf, a novel database query form interface, which is able to dynamically generate query forms. • The essence of dqf is to capture a user’s preference and r ...
... attributes. Traditional predefined query forms are not able to satisfy various ad-hoc queries from users on those databases. This paper proposes dqf, a novel database query form interface, which is able to dynamically generate query forms. • The essence of dqf is to capture a user’s preference and r ...
Course Topics - Webject Systems Inc
... More Trigger Concepts Create triggers that fire when certain database actions occur List some of the limitations of database triggers Determine when to use database triggers or Oracle Server features Create triggers by using alternative events (notINSERT/UPDATE/DELETE) Create triggers by using alter ...
... More Trigger Concepts Create triggers that fire when certain database actions occur List some of the limitations of database triggers Determine when to use database triggers or Oracle Server features Create triggers by using alternative events (notINSERT/UPDATE/DELETE) Create triggers by using alter ...
DBC-e04-Chapter-01-PP
... Structured Query Language • Structured Query Language – Acronym: SQL – Pronounced as “S-Q-L” [“Ess-Que-El”] – Originally developed by IBM as the SEQUEL language in the 1970s – SQL-92 is an ANSI national standard ...
... Structured Query Language • Structured Query Language – Acronym: SQL – Pronounced as “S-Q-L” [“Ess-Que-El”] – Originally developed by IBM as the SEQUEL language in the 1970s – SQL-92 is an ANSI national standard ...
MS-SQL Advantages - Sloan Digital Sky Survey
... Several other modules play important roles in the SA machinery. Figure 7 shows the SA software’s detailed architecture, which includes client (GUI), query support (Server), and data warehouse layers. The parser module parses an SXQL query and converts it to a query tree, which is then passed to the ...
... Several other modules play important roles in the SA machinery. Figure 7 shows the SA software’s detailed architecture, which includes client (GUI), query support (Server), and data warehouse layers. The parser module parses an SXQL query and converts it to a query tree, which is then passed to the ...
Document
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
SQL Server Backup - Pearson Education
... A complete backup makes a copy of the entire database A differential backup makes a copy of the database changes since the last complete backup Differential backups are faster and can be taken more frequently Complete backups are simpler to use for recovery • The transaction log also needs t ...
... A complete backup makes a copy of the entire database A differential backup makes a copy of the database changes since the last complete backup Differential backups are faster and can be taken more frequently Complete backups are simpler to use for recovery • The transaction log also needs t ...
Chapter 8
... – Cannot use set operators – Most restrictions are based on use of JOINs Database Systems, 10th Edition ...
... – Cannot use set operators – Most restrictions are based on use of JOINs Database Systems, 10th Edition ...
Introduction to Databases
... Runtime state is kept in process memory between calls during a session. Requires memory in the SGA for all logged-on users. Runtime state is refreshed after each database call. Requires memory in the SGA for users concurrently calling the same program. ...
... Runtime state is kept in process memory between calls during a session. Requires memory in the SGA for all logged-on users. Runtime state is refreshed after each database call. Requires memory in the SGA for users concurrently calling the same program. ...
High Availability and Disaster Recovery SQL Server Solution
... An AlwaysOn Availability Group can have no more than a total of four secondary replicas, regardless of type. This feature will be removed in a future version of Microsoft SQL Server. Use AlwaysOn Availability Groups instead. Backup, Copy, Restore is appropriate for disaster recovery, but not for hig ...
... An AlwaysOn Availability Group can have no more than a total of four secondary replicas, regardless of type. This feature will be removed in a future version of Microsoft SQL Server. Use AlwaysOn Availability Groups instead. Backup, Copy, Restore is appropriate for disaster recovery, but not for hig ...
Chapter 23 – ASP.NET
... When starting a Forms Builder session, first connect to the Oracle database. The database furnishes much of the information you need to develop the form. It supplies Forms Builder with the names of tables and columns and each column’s data type, length, and prompt properties. It also supplies cons ...
... When starting a Forms Builder session, first connect to the Oracle database. The database furnishes much of the information you need to develop the form. It supplies Forms Builder with the names of tables and columns and each column’s data type, length, and prompt properties. It also supplies cons ...
Database Technology (60) (AS - 1511010308)
... Demonstrate how to manage tablespaces and datafiles. Demonstrate an understanding of the Oracle storage structures. Demonstrate the ability to query a database. Demonstrate how to manage constraints and indexes. Demonstrate a basic understanding of the Oracle Recovery Manager tool for performing bac ...
... Demonstrate how to manage tablespaces and datafiles. Demonstrate an understanding of the Oracle storage structures. Demonstrate the ability to query a database. Demonstrate how to manage constraints and indexes. Demonstrate a basic understanding of the Oracle Recovery Manager tool for performing bac ...
OCA: Oracle Database 11g Administrator Certified Associate Study
... A view is a logical representation of data from one or more tables or views. You can think of a view as a query stored in the database. You can consider it a logical table, with rows and columns. Oracle 11g allows you to create constraints on the views and restrict the operations on views. In this c ...
... A view is a logical representation of data from one or more tables or views. You can think of a view as a query stored in the database. You can consider it a logical table, with rows and columns. Oracle 11g allows you to create constraints on the views and restrict the operations on views. In this c ...
ppt
... with a null reference and then set the reference separately: insert into departments values (`CS’, null) update departments set head = (select p.person_id from people as p where name = `John’) where name = `CS’ ...
... with a null reference and then set the reference separately: insert into departments values (`CS’, null) update departments set head = (select p.person_id from people as p where name = `John’) where name = `CS’ ...
Using SAS® Software's Metadata to Generate ETL Precursor Files in a Heterogeneous Database System
... for “Tool for Oracle Application Developers,” but in 2004 “Toad” was registered as a trademark and was no longer considered an acronym) was found to be a very powerful and functional tool that could perform essential developmental and administrative tasks, such as data loading. However, it takes sev ...
... for “Tool for Oracle Application Developers,” but in 2004 “Toad” was registered as a trademark and was no longer considered an acronym) was found to be a very powerful and functional tool that could perform essential developmental and administrative tasks, such as data loading. However, it takes sev ...
Slide 1
... An entity-relationship data model helps developers define things (entities) that will be stored in the database as they are building a data model. It also defines relationships among those entities. ...
... An entity-relationship data model helps developers define things (entities) that will be stored in the database as they are building a data model. It also defines relationships among those entities. ...
Elmasri/Navathe, Fundamentals of Database Systems, Fourth
... Copyright © 2004 Ramez Elmasri and Shamkant Navathe ...
... Copyright © 2004 Ramez Elmasri and Shamkant Navathe ...
Document
... Delete. If a tuple, t1 is deleted from r1, the system must compute the set of tuples in r2 that reference t1: ...
... Delete. If a tuple, t1 is deleted from r1, the system must compute the set of tuples in r2 that reference t1: ...