Business Modern Database Management 11th Edition Hoffer Ramesh Topi CIS4600
Modern Database Management 11th Edition Chapter 4 Terms Vocabulary
An alternative name used for an attribute.
An attribute in a relation that serves as the primary key of another relation in the same database
Foreign key pg156
An attribute or a combination of attributes that uniquely identifies each row in a relation.
Primary key pg155
Two or more attributes that have different names but the same meaning.
An error or inconsistency that may result when a user attempts to update a table that contains redundant data. The three types of anomalies are insertion, deletion and modification anomalies.
A constraint between two attributes in which the value of one attribute is determined by the value of another attribute.
Functional dependency pg178
A foreignkey in a relation that references the primary key values of the same relation.
Recursive foreign key pg171
A relation that is in second normal form and has no transitive dependencies.
Third normal form (3nf) pg183
An attribute, or combination of attributes, that uniquely identifies a row in a relation.
Candidate key pg178
An attribute that may have more than one meaning.
Example: Account can refer to a bank account, a student account or any other type of account. Therefore, account refers to different data depending on how it is used. (This is bad DB design)
A rule that states that either each foreign key value must match a primary key value in another relation or the foreign key value must be null.
Referential integrity constraint pg160
A functional dependency between the primary key and one or more nonkey attributes that are dependent on the primary key via another nonkey attribute.
Transitive dependency pg183
The attribute on the left side of the arrow in a functional dependency.
A state of relation that requires that certain rules regarding relationships between attributes (or functional dependencies) are satisfied.
Normal form pg177
A named two-dimensional table of data.
Relation pg 155
A relation that contains minimal redundancy and allows users to insert, modify, and delete the rows in a table without errors or inconsistencies.
Well-Structured relation pg162
A primary key whose value is unique across all relations.
Enterprise key pg188
The process of decomposing relations with anomalies to produce smaller, well-structured relations.
A relation in first normal form in which every nonkey attribute is fully functionally dependent on the primary key.
Second normal form (2nf) pg182
A rule that states that no primary key attribute (or component of a primary key attribute) may be null.
Entity integrity rule pg159
A value that may be assigned to an attribute when no other value applies or when the applicable value is unknown.
A serial number or other system-assigned primary key for a relation.
Surrogate primary key pg166
A relation that has a primary key and in which there are no repeating groups.
First Normal Form (1NF) pg181
A functional dependency in which one or more nonkey attributes are functionally dependent on part (but not all) of the primary key.