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Topic: Foreign Keys

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Database normalization

Relational model

	Database Priamry and Foreign Keys \| Database Solutions for Microsoft Access \| databasedev.co.uk
		Foreign keys provide a method for maintaining integrity in the data (called referential integrity) and for navigating between different instances of an entity.
		Foreign keys are formed in dependent and subtype entities by migrating the entire primary key from the parent or generic entity.
		Foreign key attributes are not considered to be owned by the entities to which they migrate, because they are reflections of attributes in the parent entities.
	www.databasedev.co.uk /primary_foreign_keys.html (936 words)

	Foreign Key [EA User Guide] (Site not responding. Last check: 2007-10-26)
		Foreign keys are represented in Enterprise Architect UML using stereotyped operations.
		A Foreign Key is modeled as an operation stereotyped with the FK stereotype; the operation parameters become the columns involved in the key.
		Foreign Keys are a feature of some database management systems, providing 'extras' such as referential integrity checking that prevents the deletion of a record if its Primary Key value exists in some other table's Foreign Key.
	www.sparxsystems.com.au /EAUserGuide/foreignkeys.htm (175 words)

	Data Modeling: Primary and Foreign Keys (Site not responding. Last check: 2007-10-26)
		Foreign keys provide a method for maintaining integrity in the data (called referential integrity) and for navigating between different instances of an entity.
		Foreign keys are formed in dependent and subtype entities by migrating the entire primary key from the parent or generic entity.
		Foreign key attributes are not considered to be owned by the entities to which they migrate, because they are reflections of attributes in the parent entities.
	www.utexas.edu /its/windows/database/datamodeling/dm/keys.html (989 words)

	Practical Database Design, Part 1; Keys and Datatypes
		Furthermore, the surrogate key typically is a single field (not a compound key), which simplifies the schema (particularly when the key is used in other tables as a foreign key).
		Foreign keys are table attributes, the values of which are the primary keys of another table.
		It bears repeating that the surrogate keys discussed earlier are part of the plumbing only -- their existence does not obviate the modeling requirement to be able to form a primary key from the business data alone.
	www.devx.com /ibm/Article/20702 (3002 words)

	SQL Table Relations, Primary and Foreign Keys, and Normalization
		Primary Key is a column or a combination of columns that uniquely identifies each row in a table.
		Foreign Key is a column or a combination of columns whose values match a Primary Key in a different table.
		In the most common scenario the relationship between 2 tables matches the Primary Key in one of the tables with a Foreign Key in the second table.
	www.sql-tutorial.com /relations-keys-normalization-sql-tutorial (1005 words)

	References and Foreign Keys
		Foreign key constraints are responsible for data referential integrity in your database.
		So, a foreign key constraint specifies that the values in a column (or a group of columns) must match the values appearing in some row of another table.
		The field being declared a foreign key requires to be declared as an index in the table definition.
	www.microolap.com /products/database/mysql-designer/help/References_and_Foreign_Keys.html (198 words)

	MySQL AB :: MySQL 5.0 Reference Manual :: 1.9.5.5 Foreign Keys
		In practice, this is often as quick as using foreign keys and is more portable.
		Foreign key support addresses many referential integrity issues, but it is still necessary to design key relationships carefully to avoid circular rules or incorrect combinations of cascading deletes.
		Note that foreign keys in SQL are used to check and enforce referential integrity, not to join tables.
	dev.mysql.com /doc/refman/5.0/en/ansi-diff-foreign-keys.html (734 words)

	Print Version - De-Embedding Foreign Keys, Part 3 \| Business intelligence, data warehousing and analytics editorial ... (Site not responding. Last check: 2007-10-26)
		Codd was not the author of the SQL language, he did not object to specifying foreign keys in statements of that language.
		If the SQL language were changed to support this method, then all references to foreign keys would disappear from SQL statements, and we would have all the benefits of late binding with none of the costs associated with implementing it ourselves.
		Since there are no embedded foreign keys, it has no way to know which relationships are one to one or one to many.
	www.dmreview.com /editorial/dmreview/print_action.cfm?articleId=2331 (1618 words)

	MySQL AB :: MySQL 5.0 Reference Manual :: 1.9.5.5 Foreign Keys
		Assuming proper design of the relationships, foreign key constraints make it more difficult for a programmer to introduce an inconsistency into the database.
		Foreign key support addresses many referential integrity issues, but it is still necessary to design key relationships carefully to avoid circular rules or incorrect combinations of cascading deletes.
		Note that foreign keys in SQL are used to check and enforce referential integrity, not to join tables.
	www.ncsu.edu /it/mirror/mysql/doc/refman/5.0/en/ansi-diff-foreign-keys.html (734 words)

	caboose Are Foreign Keys Worth Your Time? (Site not responding. Last check: 2007-10-26)
		I found a "foreign key plugin":http://wiki.rubyonrails.org/rails/pages/Foreign+Key+Schema+Dumper+Plugin on the "rails wiki":http://wiki.rubyonrails.org and had to hack it to support Oracle.
		Foreign keys are cool and all, but I won't be using them any time soon.
		By removing foreign keys before the tests and only adding the foreign keys to tables whose fixtures have been loaded a lot of the headaches are avoided.
	www.habtm.com /articles/2006/05/01/are-foreign-keys-worth-your-time (771 words)

	The Official Tourism Council Web Site for the Florida Keys! Key Largo, Islamorada, Marathon, Lower Keys, Key West
		Key Largo, Islamorada, Marathon, Lower Keys, Key West
		Or, plan a perfect Florida Keys wedding with information on venues and more.
		You'll find the Keys are far richer in cultural opportunities than most tropical getaways.
	www.fla-keys.com (297 words)

	kbAlertz: (919641) - Describes a problem that occurs because the foreign keys and the references to the foreign keys ...
		The foreign key constraints in the Microsoft CRM database are not consistent with Microsoft CRM 1.2 foreign key constraints.
		This problem occurs because the foreign keys and the references to the foreign keys are missing from the Microsoft CRM 1.2 tables.
		Resolution 1: The foreign keys and the references to the foreign keys are missing
	www.kbalertz.com /kbNamed_919641/Describes.problem.that.occurs.because.foreign.keys.references.foreign.keys.missing.from.Microsoft.Provides.aspx (757 words)

	iAnywhere.com - Managing foreign keys (Sybase Central)
		In Sybase Central, the foreign key of a table appears on the Foreign Keys tab (located on the right pane when a table is selected).
		You cannot create a foreign key in a table if the table contains values for the foreign columns that can't be matched to values in the primary table's primary key.
		To view properties after the foreign key is created, right-click the foreign key on the Foreign Keys tab and choose Properties from the popup menu.
	www.ianywhere.com /developer/product_manuals/sqlanywhere/0902/en/html/dbugen9/00000052.htm (281 words)

	Primary and foreign keys - How to find your rows
		The primary key definition of one table will be propagated to related tables (underlying tables) as foreign keys in each table.
		And, you may want to define secondary keys, unique or non-unique, for performance reasons: After the system is built, you may discover bottlenecks that can be removed by adding indexes on columns that are not a part of the primary or foreign keys.
		This article relates to Candidate Keys: column(s) that contain a term which may be an actual primary key for the table.
	www.databasedesign-resource.com /primary-and-foreign-keys.html (300 words)

	Misunderstanding Foreign Keys - O'Reilly ONLamp Blog
		I’m sure there are a number of arguments that can be made for using foreign keys etc etc, but it’s just stuff that gets in the way in a framework like rails.
		While the author is specifically referring to foreign keys not being needed for Rails, the problem is more widespread.
		Concluding that foreign keys are not necessary is very dangerous and short-sighted.
	www.oreillynet.com /onlamp/blog/2006/05/misunderstanding_foreign_keys.html (1332 words)

	Foreign Keys
		This functionality is useful where a foreign key is of a super-type, such as a Location and there are several Tables that represent Locations, for example a Country, State or City.
		To specify a Bean Key two columns are needed one is the foreign key and the other is the type of the key.
		The type of the key is specified using a special Enumerated Type called a Bean Type, where the class name must be used as the Enumerated Types name, and this must correspond to the class names of other beans in the package.
	www.javelinsoft.com /jgenerator/guide/foreignkeys.html (1037 words)

	Foreign Keys - steps to enable - The MySQL Relational Database
		If you do choose to use foreign keys, no, the name of the key does not have to be identical to the name given to the corresponding primary key.
		Since foreign keys just maintain integrity, they don't provide a means by which you can enter data that goes into several tables at a time (quite the reverse - they can prevent you adding information to a child table when there isn't a matching element in the parent).
		The primary key of seller is the id column, and that id is the "foreign key" in property, where it's called s_id (short for seller id).
	www.wellho.net /forum/The-MySQL-Relational-Database/Foreign-Keys-steps-to-enable.html (1736 words)

	Key West Florida Official Tourism Website - Southernmost City in the Continental USA
		Come and fish in the waters of the Florida Keys and Key West where fishing legends were born.
		But you don't have to be a legend or a writer to enjoy the thrill of big game fishing year round in the Keys, just bring your boat on down or charter one of ours.
		Remember you don't have to be a legend or a writer to enjoy big game fishing in the Florida Keys, but you may run the risk of becoming a legend in your own time.
	www.fla-keys.com /fishing (319 words)

	All About Accommodations
		Travel to the Keys is heavily dependent on factors such as the weather here and "back home," the time of season, foreign exchange rates, political and economic climates, and God knows what else.
		The Keys abound in sunshine and tropical weather and almost all guest accommodations have pools around which to take in the sun.
		The Keys are coral islands surrounded by mangroves and shallow flats and protected from wave action by the reefs 2-5 miles off shore.
	www.keywest-reservations.com /ACCOM.HTM (439 words)

	The FreeBSD Diary -- PostgreSQL - removing foreign keys
		There are two triggers on master; one for the primary key, another for the not null constraint.
		If we have more than one foreign key, the process is a bit more complex.
		As you can see, the work is quite reduced when it comes to removing a foreign key.
	www.freebsddiary.org /postgresql-dropping-constraints.php (933 words)

	Visitor Information for the Florida Keys NMS
		The Keys are located on the southern tip of the Florida peninsula, beginning just south of Key Biscayne and ending just 90 miles north of Cuba.
		Management in the state and federal waters is achieved through a cooperative agreement with the State of Florida Department of Environmental Protection and the Florida Fish and Wildlife Conservation Commission.
		However, warning signs that the Keys' environment and natural resources were fragile, and not infinite, came early.
	www.fknms.nos.noaa.gov /visitor_information/welcome.html (2739 words)

	Big Pine & the Lower Keys Florida Keys Official Tourism Site
		Here, you can snorkel or dive over the Looe Key coral reef, ride a bicycle through Key Deer country, or take a fishing adventure in the back country or troll the deep blue waters beyond the reef.
		In fact, the uninhabited Saddlebunch Keys are a network of sandy lagoons and mangrove islands that make the jaunt a memorable one, especially at sunset.
		Snorkeling in the Keys is stellar at spectacular reefs teeming with abundant sea life.
	fla-keys.com /lowerkeys (584 words)

	are foreign keys realized as indexes? - Dev Archives
		Foreign keys are a fundamental semantic of the relational model.
		keys, when they are the basis of the relational model.
		The index covers the columns that make up the primary key or unique columns (a multicolumn index, if appropriate), and is the mechanism that enforces the constraint.
	archives.devshed.com /forums/databases-124/are-foreign-keys-realized-as-indexes-2290588.html?goto=lastpost (2284 words)

	Islamorada Florida Keys Official Tourism Site Sportfishing Capital of the World
		Islamorada is comprised of six islands including Plantation Key, Windley Key, Upper Matecumbe Key, Lower Matecumbe Key and the offshore islands of Lignumvitae Key and Indian Key.
		This might be the only place on Earth where it is possible to catch a sailfish in the morning, and then venture into the backcountry in pursuit of bonefish, permit, tarpon, snook and redfish in just inches of water.
		A trip to Islamorada would not be complete without sampling some of the local island cuisine headlined by succulent fresh seafood served everywhere from island tiki bars and dockside fish houses to gourmet beachfront cafes and secluded island bistros.
	fla-keys.com /islamorada (554 words)

	SQL Database Recovery Software - Recover Corrupted MDF Database
		Kernel Recovery for SQL is equipped with powerful QFSCI algorithm which performs fast and effective data recovery and provides with accurate recovery results.
		Tables, Views, triggers, stored procedures are easily recovered and the damaged unique keys, primary keys and foreign keys are also repaired by Kernel Recovery for SQL - database recovery software.
		Recovery of primary keys, indexes, unique keys and foreign keys.
	www.nucleustechnologies.com /sql-recovery.html (322 words)

	PostgreSQL: Documentation: Manuals: PostgreSQL 8.1: Foreign Keys
		ERROR: insert or update on table "weather" violates foreign key constraint "weather_city_fkey" DETAIL: Key (city)=(Berkeley) is not present in table "cities".
		The behavior of foreign keys can be finely tuned to your application.
		Making correct use of foreign keys will definitely improve the quality of your database applications, so you are strongly encouraged to learn about them.
	www.postgresql.org /docs/8.1/static/tutorial-fk.html (214 words)

	Forex tutorial and guide - download 10 keys to success free - in the forex foreign currency exchange, with live trading ... (Site not responding. Last check: 2007-10-26)
		Forex tutorial and guide - download 10 keys to success free - in the forex foreign currency exchange, with live trading calls.
		It is the mission of the Forex trader to become a financially successful long-term trader.
		There is substantial earnings to be made in the foreign currency market, but trading in the Forex is for the well-informed.
	www.mtiafrica.co.za /forexkeys.htm (471 words)

	OraDot :: share - discover - promote - How to find tables with multiple foreign keys to the same referenced table (Site not responding. Last check: 2007-10-26)
		OraDot home » development » How to find tables with multiple foreign keys to the same referenced table
		How to find tables with multiple foreign keys to the same referenced table
		A query against the Data Dictionary that will bring up all tables with more than one Foreign Key to the same Referenced Table - it will list every Foreign Key involved in a reference to a table that is referenced by another foreign key from the same table as well.
	oradot.com /story.php?title=How-to-find-tables-with-multiple-foreign-keys-to-same-referenced-table (110 words)

	AMIS Technology blog » Blog Archive » Putting Analytical Functions to good use - find tables with multiple ...
		The query returns all Foreign Keys with the Detail (the referencing) Table and the Master (or referenced) Table.
		We then filter to only retain the records where either the next referenced table or the previous referenced table is the same as the currently referenced table.
		Whenever two or more records for foreign keys from the same detail table reference the same master table, we will have records returned by this query.
	technology.amis.nl /blog/?p=1353 (875 words)

	gmontrone : Disabling Foreign Keys and Triggers - Sql Server 2005
		Sometimes it's just necessary to get rid of foreign key constraints and triggers in order to do maintenance on a database.
		While foreign key constraints help maintain relational integrity, it can be a huge pain in the rear when you are trying to do basic operations.
		Of course doing this should only be done when you know-for-sure that you won't ruin the overall integrity of the database.
	devauthority.com /blogs/gmontrone/archive/2006/11/02/8369.aspx (246 words)

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