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Data Management Foundation C175 WGU Questions and Answers.
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Data Management Foundation C175 WGU Questions and Answers.
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Data Management Foundation C175 WGUQuestions and Answers
Associative Entity - (correct answer) -An associative entity is an element of the entity-relationship
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model. All relationships for the associative entity should be many.
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Attribute - (correct answer) -An attribute is a property or characteristic of an entity.
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Binary relationship - (correct answer) -A binary relationship is a relationship between two entity types.
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Candidate Key - (correct answer) -Is any column or a combination of columns that can qualify as unique
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key in database.
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Cardinality - (correct answer) -Cardinality represents the maximum number of entities that can be
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involved in a particular relationship.
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Cartesian product - (correct answer) -Usually the result of a missing join condition or a method of
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expanding the data of 1 table by the number of rows in the second table.
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Cascade Delete - (correct answer) -Will delete all records that reference the primary key
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column subquery - (correct answer) -Returns a single column of one or more values.
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data encryption - (correct answer) -When data is encrypted, it is changed, bit by bit or character by
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character, into a form that looks totally garbled. It can and must be reconverted, or decrypted, back to
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its original form to be of use.
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Data normalization - (correct answer) -Is a methodology for organizing attributes into tables so that
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redundancy among the non-key attributes is eliminated.
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Data volatility - (correct answer) -Describes how often stored data is updated.
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Data Volume Assessment - (correct answer) -Understanding of how much data will be in a database or
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a table within a database
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Database - (correct answer) -A database is a collection of information that is organized so that it can
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easily be accessed, managed, and updated.
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DCL - (correct answer) -Data control language is used to control access to data stored in a database.
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, DDL - (correct answer) -Data definition language - involves instructing the DBMS software on what
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tables will be in the database, what attributes will be in the tables, which attributes will be indexed,
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and so forth.
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Definer - (correct answer) -Definer is a MySQL term where AuthID is the same for another DBMS
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Denormalization - (correct answer) -The act of duplicating data in a database for performance or the yi yi yi yi yi yi yi yi yi yi yi yi yi yi yi
preservation of historical information
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disaster recovery - (correct answer) -Involves rebuilding an entire information system or significant
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parts of one after a catastrophic natural disaster such as a hurricane, tornado, earthquake, building
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collapse, or even a major fire.
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DML - (correct answer) -Data manipulation language refers to the four basic operations that can and
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must be performed on data stored in any DBMS: data retrieval, data update, insertion of new records,
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and deletion of existing records.
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E-R model - (correct answer) -An E-R model is a data model for describing a database in an abstract
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way.
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embedded mode - (correct answer) -The SELECT command is embedded within the lines of a higher-
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level language program and functions as an input or "read" statement for the program.
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Entity - (correct answer) -An entity is an object or event in our environment that we want to keep track
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of.
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Foreign Key - (correct answer) -Is a field (or collection of fields) in one table that uniquely identifies a
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row of another table.
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Index - (correct answer) -Used to help a DBMS find data quickly
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Inner Join - (correct answer) -Shows row that have matches in both tables
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Intersection Data - (correct answer) -Intersection Data associated with the concatenation of two
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segments.
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Join - (correct answer) -Joins 2 tables together
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logical view - (correct answer) -Is a mapping onto a physical table or tables that allows an end user to
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access only a specified portion of data.
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Modality - (correct answer) -Modality represents the minimum number of entity occurrences that can
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be involved in a relationship.
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outer join - (correct answer) -Shows rows in one table that have no match in the other table. Two kinds
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of outer joins are left and right joins.
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