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WESTERN GORVERNORS UNIVERSITY C170 CLOSSARY OF ALL CHAPTER TERMS- CASE STUDY
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WESTERN GORVERNORS UNIVERSITYC170 CLOSSARY OF ALL CHAPTER
TERMS- CASE STUDY
Western Governors University - C170
Course Study Glossary of all Chapter Terms
This study source was downloaded by 100000833345068 from CourseHero.com on 10-08-2021 16:32:44 GMT -05:00
https://www.coursehero.com/file/31277264/WGU-C170-All-Terms-from-Course-Study-Guidepdf/
, 1. AREA: In DB2, a named section of permanent storage space that
is reserved to store the database.
2. associative entity: See composite entity. 3.bridge entity: See
composite entity.
3. candidate key: A minimal superkey; that is, a key that does not
contain a subset of attributes that is itself a superkey. See key.
4. closure: A property of relational operators that permits the use
of relational algebra operators on existing tables (relations) to
produce new relations.
5. composite entity: An entity designed to transform an M:N
relationship into two 1:M relationships. The composite entity's
primary key comprises at least the primary keys of the entities
that it connects. Also known as a bridge entity or associative
entity. See also linking table.
6. composite key: A multiple-attribute key.
7. dependent: An attribute whose value is determined by another
attribute. 9.determination: The role of a key. In the context of a
database table, the statement "A
8. determines B" indicates that knowing the value of attribute A
means that the value of attribute B can be looked up.
9. DIFFERENCE: In relational algebra, an operator used to yield all
rows from one table that are not found in another union-
compatible table.
10. DIVIDE: In relational algebra, an operator that answers
queries about one set of data being associated with all values of
data in another set of data.
11. domain: In data modeling, the construct used to organize
and describe an attribute's set of possible values.
12. entity integrity: The property of a relational table that
guarantees each entity has a unique value in a primary key and
that the key has no null values.
This study source was downloaded by 100000833345068 from CourseHero.com on 10-08-2021 16:32:44 GMT -05:00
https://www.coursehero.com/file/31277264/WGU-C170-All-Terms-from-Course-Study-Guidepdf/
, 13. equijoin: A join operator that links tables based on an
equality condition that compares specified columns of the tables.
14. flags: Special codes implemented by designers to trigger a
required response, alert end users to specified conditions, or
encode values. Flags may be used to prevent nulls by bringing
attention to the absence of a value in a table.
15. foreign key (FK): An attribute or attributes in one table
whose values must match the primary key in another table or
whose values must be null. See key.
16. full functional dependence: A condition in which an
attribute is functionally dependent on a composite key but not on
any subset of the key.
17. functional dependence: Within a relation R, an attribute B
is functionally dependent on an attribute A if and only if a given
value of attribute A determines exactly one value of attribute B.
The relationship "B is dependent on A" is equivalent to "A
determines B," and is written as A B. 19.homonyms: The use of
the same name to label different attributes. Homonyms generally
should be avoided. Some relational software automatically
checks for homonyms and either alerts the user to their
existence or automatically makes the appropriate adjustments.
See also synonym.
This study source was downloaded by 100000833345068 from CourseHero.com on 10-08-2021 16:32:44 GMT -05:00
https://www.coursehero.com/file/31277264/WGU-C170-All-Terms-from-Course-Study-Guidepdf/
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