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- Cardinality_(data_modeling) abstract "In database design, the cardinality or fundamental principle of one data table with respect to another is a critical aspect. The relationship of one to the other must be precise and exact between each other in order to explain how each table links together. In the relational model, tables can be related as any of \"one-to-many\" or \"many-to-many\". This is said to be the cardinality of a given table in relation to another.For example, consider a database designed to keep track of hospital records. Such a database could have many tables like: a doctor table with information about physicians; a patient table for medical subjects undergoing treatment; and a department table with an entry for each division of a hospital.In that model: There is a many-to-many relationship between the records in the doctor table and records in the patient table because doctors have many patients, and a patient could have several doctors; There is a one-to-many relationship between the department table and the doctor table because each doctor may work for only one department, but one department could have many doctors.A \"one-to-one\" relationship is mostly used to split a table in two in order to provide information concisely and make it more understandable. In the hospital example, such a relationship could be used to keep apart doctors' own unique professional information from administrative details.In data modeling, collections of data elements are grouped into \"data tables\" which contain groups of data field names called \"database attributes\". Tables are linked by \"key fields\". A \"primary key\" assigns a field to its \"special order table\". For example, the \"Doctor Last Name\" field might be assigned as a primary key of the Doctor table with all people having same last name organized alphabetically according to the first three letters of their first name. A table can also have a foreign key which indicates that field is linked to the primary key of another table.A complex data model can involve hundreds of related tables. A renowned computer scientist, Edgar F. Codd, created a systematic method to decompose and organize relational databases. Codd's steps for organizing database tables and their keys is called Database Normalization. Database normalization avoids certain hidden database design errors (delete anomalies or update anomalies). In real life the process of database normalization ends up breaking tables into a larger number of smaller tables. In real world, data modeling is critical because as the data grows voluminous, tables linked by keys must be used tospeed up programmed retrieval of data. If a data model is poorly crafted, even a computer applications system with just a millionrecords will give the end-users unacceptable response time delays. For this reason, data modeling is a keystone in the skillsneeded by a modern software developer.".
- Cardinality_(data_modeling) wikiPageExternalLink www.agiledata.org.
- Cardinality_(data_modeling) wikiPageExternalLink Relationships.
- Cardinality_(data_modeling) wikiPageID "8237163".
- Cardinality_(data_modeling) wikiPageLength "4557".
- Cardinality_(data_modeling) wikiPageOutDegree "9".
- Cardinality_(data_modeling) wikiPageRevisionID "703453694".
- Cardinality_(data_modeling) wikiPageWikiLink Arity.
- Cardinality_(data_modeling) wikiPageWikiLink Category:Data_modeling.
- Cardinality_(data_modeling) wikiPageWikiLink Category:Relational_model.
- Cardinality_(data_modeling) wikiPageWikiLink Database_normalization.
- Cardinality_(data_modeling) wikiPageWikiLink Edgar_F._Codd.
- Cardinality_(data_modeling) wikiPageWikiLink Entity–relationship_model.
- Cardinality_(data_modeling) wikiPageWikiLink Object_(computer_science).
- Cardinality_(data_modeling) wikiPageWikiLink Relational_database.
- Cardinality_(data_modeling) wikiPageWikiLinkText "Cardinality (data modeling)".
- Cardinality_(data_modeling) wikiPageWikiLinkText "cardinalities".
- Cardinality_(data_modeling) wikiPageWikiLinkText "cardinality constraint".
- Cardinality_(data_modeling) wikiPageWikiLinkText "cardinality".
- Cardinality_(data_modeling) wikiPageWikiLinkText "many-to-one relationship".
- Cardinality_(data_modeling) wikiPageWikiLinkText "one to many relationship".
- Cardinality_(data_modeling) wikiPageWikiLinkText "one-to-many".
- Cardinality_(data_modeling) wikiPageUsesTemplate Template:Database.
- Cardinality_(data_modeling) subject Category:Data_modeling.
- Cardinality_(data_modeling) subject Category:Relational_model.
- Cardinality_(data_modeling) hypernym Aspect.
- Cardinality_(data_modeling) type Saint.
- Cardinality_(data_modeling) comment "In database design, the cardinality or fundamental principle of one data table with respect to another is a critical aspect. The relationship of one to the other must be precise and exact between each other in order to explain how each table links together. In the relational model, tables can be related as any of \"one-to-many\" or \"many-to-many\". This is said to be the cardinality of a given table in relation to another.For example, consider a database designed to keep track of hospital records.".
- Cardinality_(data_modeling) label "Cardinality (data modeling)".
- Cardinality_(data_modeling) sameAs Q362383.
- Cardinality_(data_modeling) sameAs Kardinalität_(Datenbankmodellierung).
- Cardinality_(data_modeling) sameAs Cardinalité_(programmation).
- Cardinality_(data_modeling) sameAs m.026x92n.
- Cardinality_(data_modeling) sameAs Q362383.
- Cardinality_(data_modeling) sameAs 基数_(数据建模).
- Cardinality_(data_modeling) wasDerivedFrom Cardinality_(data_modeling)?oldid=703453694.
- Cardinality_(data_modeling) isPrimaryTopicOf Cardinality_(data_modeling).