Superkey a Study guides, Class notes & Summaries

WGU C170 DATA MANAGEMENT – APPLICATIONS EXAM 2024 WITH 100% CORRECT ANSWERS In data modeling, the construct used to organize and describe an attribute's set of possible values - correct answer domain An attribute or attributes that uniquely identify each entity in a table. Any composite key with this is also this. - correct answer superkey A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey - correct answer candidate key The pr...

WGU C170 Data Management - Applications|Latest Update Complete with A+ Graded Answers Domain In data modeling, the construct used to organize and describe an attribute's set of possible values. Primary key (PK) An identifier composed of one or more attributes that uniquely identifies a row. Also, a candidate key selected as a unique entity identifier. A minimal superkey. Key One or more attributes that determine other attributes. Determination The role of a key. In the c...

Data Management Applications C170 What is a table? A table is a persistent representation of a logical relation that is a relation whose contents can be saved for permanent use. What are the characteristics of a relational table? The characteristics of a relational table are that a table is perceived as a two-dimensional structure composed of rows and columns, each row (tuple) represents a single entity occurrence within the set, each column represents an attribute, each column has a dis...

Domain In data modeling, the construct used to organize and describe an attribute's set of possible values. Primary key (PK) An identifier composed of one or more attributes that uniquely identifies a row. Also, a candidate key selected as a unique entity identifier. A minimal superkey. Key One or more attributes that determine other attributes. Determination The role of a key. In the context of a database table, the statement "A determines B" indicates that knowing the value of attr...

WGU C170 Data Management - Applications|Latest Update Complete with A+ Graded Answers Domain In data modeling, the construct used to organize and describe an attribute's set of possible values. Primary key (PK) An identifier composed of one or more attributes that uniquely identifies a row. Also, a candidate key selected as a unique entity identifier. A minimal superkey. Key One or more attributes that determine other attributes. Determination The role of a key. In the c...

In a relational model, _______ are also used to establish relationships among tables and to ensure the integrity of the data. o :## keys A _____ key can be described as a minimal superkey, a superkey without any unnecessary attributes. o :## candidate A _____ key is defined as a key that is used strictly for data retrieval purposes. o :## secondary _____ logic, used extensively in mathematics, provides a framework in which an assertion (statement of fact) can be verified as either ...

WGU C170 Exam (Latest 2024/ 2025 Update) Data Management Applications Exam| 100% Correct| Grade A Q: What are homonyms and synonyms, and why should they be avoided in database design? Answer: Homonyms appear when more than one attribute has the same name. Synonyms exist when the same attribute has more than one name. Avoid both to avoid inconsistencies. Q: How would you implement a 1:M relationship in a database composed of two tables? Answer: A car is owned just by one custome...

AREA Ans- In DB2, a named section of permanent storage space that is reserved to store the database. candidate key Ans- A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey. closure Ans- A property of relational operators that permits the use of relational algebra operators on existing tables (relations) to produce new relations. composite entity Ans- An entity designed to transform an M:N relationship into two 1:M relationships...

WGU C170 - Data Management – Applications Latest 2024 Already Graded A Domain In data modeling, the construct used to organize and describe an attribute's set of possible values. Primary key (PK) An identifier composed of one or more attributes that uniquely identifies a row. Also, a candidate key selected as a unique entity identifier. A minimal superkey. Key One or more attributes that determine other attributes. Determination The role of a key. In the context of a database...

external schema - Answer-Also called a subschema, this is a specific view of the data utilized by an end user conceptual schema - Answer-This describes all the entities, attributes, and relationships together with integrity constraints. Each DB has exactly one. internal schema - Answer-A complete description of the internal model, down to the physical storage of data. Each DB has exactly one. logical data independence - Answer-The immunity of the external schemas to changes in the concept...