WGU D427 Data Management Applications Exam Graded A+
Database Model - ANSWER-is a conceptual framework for database systems, with three parts 3 Parts of the Database Model - ANSWER-Data structures, operations, rules Data structures - ANSWER-prescribe how data is organized Operations - ANSWER-manipulate data structures Rules - ANSWER-govern valid data Big Data - ANSWER-characterized by unprecedented data volumes and rapidly changing data structures. Set - ANSWER-is an unordered collection of elements enclosed in braces. Ex: {a, b, c} and {c, b, a} are the same, since sets are not ordered. Tuple - ANSWER-is an ordered collection of elements enclosed in parentheses. Ex: (a, b, c) and (c, b, a) are different, since tuples are ordered. Database Terminology - ANSWER-Table Column Row Data Type Math Terminology - ANSWER-Relation Attribute Tuple Domain File Terminology - ANSWER-File Field Record Data Type Select (Relational) - ANSWER-selects a subset of rows of a table Project (Relational) - ANSWER-eliminates one or more columns of a table
Información del documento
- Subido en
- 22 de octubre de 2023
- Número de páginas
- 13
- Escrito en
- 2023/2024
- Tipo
- Examen
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- Preguntas y respuestas
