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14 relations: Candidate key, Cardinality (data modeling), Compound key, Database, Foreign key, Functional dependency, Multiset, Primary key, Projection (relational algebra), Relation (database), Relational algebra, Relational model, Set (mathematics), Tuple.
Candidate key
In the relational model of databases, a candidate key of a relation is a minimal superkey for that relation; that is, a set of attributes such that.
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Cardinality (data modeling)
In database design, the cardinality or fundamental principle of one data aspect with respect to another is a critical feature.
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Compound key
In database design, a composite key is a candidate key that consists of two or more attributes (table columns) that uniquely identify an entity occurrence (table row).
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Database
A database is an organized collection of data, stored and accessed electronically.
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Foreign key
In the context of relational databases, a foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table.
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Functional dependency
In relational database theory, a functional dependency is a constraint between two sets of attributes in a relation from a database.
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Multiset
In mathematics, a multiset (aka bag or mset) is a modification of the concept of a set that, unlike a set, allows for multiple instances for each of its elements.
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Primary key
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table).
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Projection (relational algebra)
In relational algebra, a projection is a unary operation written as \Pi_(R) where a_1,...,a_n is a set of attribute names.
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Relation (database)
In relational database theory, a relation, as originally defined by E. F. Codd, is a set of tuples (d1, d2,..., dn), where each element dj is a member of Dj, a data domain.
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Relational algebra
Relational algebra, first created by Edgar F. Codd while at IBM, is a family of algebras with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it.
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Relational model
The relational model (RM) for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd, where all data is represented in terms of tuples, grouped into relations.
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Set (mathematics)
In mathematics, a set is a collection of distinct objects, considered as an object in its own right.
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Tuple
In mathematics, a tuple is a finite ordered list (sequence) of elements.
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