First class (computing) - Revision history

Annoyedhumanoid: Undid revision 888626012 by Krauss (talk)

2024-03-09T02:49:30Z

Undid revision 888626012 by Krauss (talk)

← Previous revision		Revision as of 02:49, 9 March 2024
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	{{For\|general usage outside databases\|First-class object}}		{{For\|general usage outside databases\|First-class object}}
	{{Unreferenced\|date=December 2009}}		{{Unreferenced\|date=December 2009}}

	: merge with [[primary key]]

	In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

Krauss: This article is coupled with primary key article

2019-03-20T10:48:38Z

This article is coupled with primary key article

← Previous revision		Revision as of 10:48, 20 March 2019
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	{{For\|general usage outside databases\|First-class object}}		{{For\|general usage outside databases\|First-class object}}
	{{Unreferenced\|date=December 2009}}		{{Unreferenced\|date=December 2009}}

			: merge with [[primary key]]

	In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

Miracle Pen at 08:41, 11 May 2013

2013-05-11T08:41:57Z

← Previous revision		Revision as of 08:41, 11 May 2013
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	{{~~Dablink~~\|~~For~~ general usage outside databases~~, see [[~~First-class object]]}}		{{For\|general usage outside databases\|First-class object}}
	{{Unreferenced\|date=December 2009}}		{{Unreferenced\|date=December 2009}}

Mark Renier: // clean up using AWB

2012-06-25T02:46:35Z

// clean up using AWB

← Previous revision		Revision as of 02:46, 25 June 2012
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⚫	{{Unreferenced\|date=December 2009}}
	{{Dablink\|For general usage outside databases, see [[First-class object]]}}		{{Dablink\|For general usage outside databases, see [[First-class object]]}}
		⚫	{{Unreferenced\|date=December 2009}}

	In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

SmackBot: remove Erik9bot category,outdated, tag and general fixes

2009-12-17T05:05:02Z

remove Erik9bot category,outdated, tag and general fixes

← Previous revision		Revision as of 05:05, 17 December 2009
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			{{Unreferenced\|date=December 2009}}
	{{~~dablink~~\|For general usage outside databases, see [[First-class object]]}}		{{Dablink\|For general usage outside databases, see [[First-class object]]}}

	In [[~~Database~~ model~~\|database modeling~~]], a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

	As a general rule, first class items represent things rather than relationships. For example, the database representations of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not a first class item. Likewise, data ''about'' that relationship, e.g. information about the salary the company pays to its employee, is not a first class item.		As a general rule, first class items represent things rather than relationships. For example, the database representations of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not a first class item. Likewise, data ''about'' that relationship, e.g. information about the salary the company pays to its employee, is not a first class item.
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	In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.		In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.

			{{DEFAULTSORT:First Class (Computing)}}
	[[Category:Data modeling]]		[[Category:Data modeling]]
	[[Category:Articles lacking sources (Erik9bot)]]

Erik9bot: add Category:Articles lacking sources (Erik9bot)

2009-07-05T11:52:09Z

add Category:Articles lacking sources (Erik9bot)

← Previous revision		Revision as of 11:52, 5 July 2009
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	[[Category:Data modeling]]		[[Category:Data modeling]]
			[[Category:Articles lacking sources (Erik9bot)]]

Nurg: copy edit for clarity

2008-12-22T02:28:37Z

copy edit for clarity

← Previous revision		Revision as of 02:28, 22 December 2008
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	{{dablink\|For general usage outside databases, see [[First-class object]]}}		{{dablink\|For general usage outside databases, see [[First-class object]]}}

	In [[Database model\|database modeling]], a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and other items to claim relationships with the item.		In [[Database model\|database modeling]], a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

	As a general rule, first class items represent things rather than relationships. For example, the database representations of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not a first class item. Likewise, data ''about'' that relationship, e.g. information about the salary the company pays to its employee, is not a first class item.		As a general rule, first class items represent things rather than relationships. For example, the database representations of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not a first class item. Likewise, data ''about'' that relationship, e.g. information about the salary the company pays to its employee, is not a first class item.

Nurg: copy edit for clarity

2008-12-22T02:26:43Z

copy edit for clarity

← Previous revision		Revision as of 02:26, 22 December 2008
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	In [[Database model\|database modeling]], a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and other items to claim relationships with the item.		In [[Database model\|database modeling]], a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and other items to claim relationships with the item.

	As a general rule, first class items represent things rather than relationships. For example, the [[database representations]] of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not, ~~nor~~ is data ''about'' that relationship, e.g. information about the salary the company pays to its employee.		As a general rule, first class items represent things rather than relationships. For example, the database representations of a human and of a company are each first class items. However, the fact that the person is an employee of that company is not a first class item. Likewise, data ''about'' that relationship, e.g. information about the salary the company pays to its employee, is not a first class item.

	Typically, a [[relational database]] will include several [[table (information)\|table]]s, each of which contains [[row (database)\|rows]] representing first class items of a given type (e.g. a table of people, a table of companies). It will also contain other tables representing relationships between these first class items.		Typically, a [[relational database]] will include several [[table (information)\|table]]s, each of which contains [[row (database)\|rows]] representing first class items of a given type (e.g. a table of people, a table of companies). It will also contain other tables representing relationships between these first class items.

Cander0000: refined category

2007-08-28T04:38:57Z

refined category

← Previous revision		Revision as of 04:38, 28 August 2007
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	In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.		In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.

	[[Category:~~Database~~ modeling]]		[[Category:Data modeling]]

Cander0000: refined category

2007-08-28T04:38:41Z

refined category

← Previous revision		Revision as of 04:38, 28 August 2007
Line 11:		Line 11:
	In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.		In a relational database, a table representing a ''relationship'' between two or more first class items (or data about that relationship) will usually ''not'' have special identifiers for its rows. Instead these rows will be identified by an ordered [[tuple]] consisting of unique identifiers of the first class items involved in the relationship.

	[[Category:Database ~~management systems~~]]		[[Category:Database modeling]]

← Previous revision		Revision as of 02:49, 9 March 2024
Line 1:		Line 1:
	{{For\|general usage outside databases\|First-class object}}		{{For\|general usage outside databases\|First-class object}}
	{{Unreferenced\|date=December 2009}}		{{Unreferenced\|date=December 2009}}

	: merge with [[primary key]]

	In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.

← Previous revision		Revision as of 10:48, 20 March 2019
Line 1:		Line 1:
	{{For\|general usage outside databases\|First-class object}}		{{For\|general usage outside databases\|First-class object}}
	{{Unreferenced\|date=December 2009}}		{{Unreferenced\|date=December 2009}}

			: merge with [[primary key]]

	In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.		In [[database model]]ing, a '''first class''' item is one that has an [[identity (object-oriented programming)\|identity]] independent of any other item. The identity allows the item to persist when its attributes change, and allows other items to claim relationships with the item.