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Data Management Foundations WGU C175|260 Questions and Answers
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Data Management Foundation C175WGU/84 Complete Questions and
Answers
Associative Entity - -An associative entity is an element of the entity-
relationship model. All relationships for the associative entity should be
many.
-Attribute - -An attribute is a property or characteristic of an entity.
-Binary relationship - -A binary relationship is a relationship between two
entity types.
-Candidate Key - -Is any column or a combination of columns that can
qualify as unique key in database.
-Cardinality - -Cardinality represents the maximum number of entities that
can be involved in a particular relationship.
-Cartesian product - -Usually the result of a missing join condition or a
method of expanding the data of 1 table by the number of rows in the
second table.
-Cascade Delete - -Will delete all records that reference the primary key
-column subquery - -Returns a single column of one or more values.
-data encryption - -When data is encrypted, it is changed, bit by bit or
character by character, into a form that looks totally garbled. It can and must
be reconverted, or decrypted, back to its original form to be of use.
-Data normalization - -Is a methodology for organizing attributes into tables
so that redundancy among the non-key attributes is eliminated.
-Data volatility - -Describes how often stored data is updated.
-Data Volume Assessment - -Understanding of how much data will be in a
database or a table within a database
-Database - -A database is a collection of information that is organized so
that it can easily be accessed, managed, and updated.
-DCL - -Data control language is used to control access to data stored in a
database.
, -DDL - -Data definition language - involves instructing the DBMS software
on what tables will be in the database, what attributes will be in the tables,
which attributes will be indexed, and so forth.
-Definer - -Definer is a MySQL term where AuthID is the same for another
DBMS
-Denormalization - -The act of duplicating data in a database for
performance or the preservation of historical information
-disaster recovery - -Involves rebuilding an entire information system or
significant parts of one after a catastrophic natural disaster such as a
hurricane, tornado, earthquake, building collapse, or even a major fire.
-DML - -Data manipulation language refers to the four basic operations that
can and must be performed on data stored in any DBMS: data retrieval, data
update, insertion of new records, and deletion of existing records.
-E-R model - -An E-R model is a data model for describing a database in an
abstract way.
-embedded mode - -The SELECT command is embedded within the lines of
a higher-level language program and functions as an input or "read"
statement for the program.
-Entity - -An entity is an object or event in our environment that we want to
keep track of.
-Foreign Key - -Is a field (or collection of fields) in one table that uniquely
identifies a row of another table.
-Index - -Used to help a DBMS find data quickly
-Inner Join - -Shows row that have matches in both tables
-Intersection Data - -Intersection Data associated with the concatenation of
two segments.
-Join - -Joins 2 tables together
-logical view - -Is a mapping onto a physical table or tables that allows an
end user to access only a specified portion of data.
-Modality - -Modality represents the minimum number of entity occurrences
that can be involved in a relationship.
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