Composite primary key - Study guides, Class notes & Summaries

Sofia Relational Databases Unit 3.1 Latest Update Graded A+ What is a primary key in a relational database? A unique identifier for each record in a table. Why are foreign keys important in relational databases? They establish relationships between tables and ensure data integrity. What is the purpose of a JOIN operation in SQL? To combine rows from two or more tables based on a related column. How does normalization benefit relational databases? It reduces data redundancy a...

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 - D426 Exam; Questions and Answers 100% Correct A ____ is a column, or group of columns, used to identify a row. Correct answer Primary key A ____ consists of a single column. Correct answer Simple primary key A ____ key consists of multiple columns. Correct answer Composite primary All primary keys columns are necessary for uniqueness. When any column is removed, the resulting simple or composite column is no longer unique. Correct answer Minimal The ____ constraint in the CREATE...

WGU D426 Study Guide (Latest 2024/ 2025 Update) Data Management Foundations | Questions and Verified Answers|100% Correct| Grade A Q: Crows Foot Notation Depicts cardinality as a circle (zero), or a short line (one), or three short lines (many). The short likes look like a bird's foot. Q: Single-level index Answer: A file containing column values, along with points to rows containing the column value. Q: Multi-column index Answer: A composite of values from all indexed ...

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...

WGU C170 Study Guide (Latest 2024/ 2025 Update) Data Management Applications Exam| 100% Correct| Grade A Q: domain: In data modeling, the construct used to organize and describe an attribute's set of possible values. Q: entity integrity Answer: 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. Q: equijoin Answer: A join operator that links tables based on an equality condition tha...

A ____ is a column, or group of columns, used to identify a row. -Correct Answer Primary key A ____ consists of a single column. -Correct Answer Simple primary key A ____ key consists of multiple columns. -Correct Answer Composite primary All primary keys columns are necessary for uniqueness. When any column is removed, the resulting simple or composite column is no longer unique. -Correct Answer Minimal The ____ constraint in the CREATE TABLE statement names the table's ____. The...

WGU C175 Data Management Foundations Final Exam Questions and Answers 2024/2025 Graded A+ . Which of the following is true of business rules? entity A(n) _______ is anything about which data are to be collected and stored. XML/Hybrid data model Oracle 11g is an example of the _______. entity instance Each row in the relational table is known as a(n) relational data model MySQL is an example of the _______. attribute A(n) _______ is the equivalent of a field in a file system. entity re...

AMT Airframe Written Test (FAA) Questions and Answers Already Passed What is the primary benefit of using composite materials in aircraft construction? They provide high strength-to-weight ratios and corrosion resistance, enhancing performance and longevity. How do winglets improve an aircraft's efficiency? They reduce induced drag by controlling the airflow around the wingtip, leading to better fuel efficiency. What is the purpose of the aircraft's pitot-static system? To m...

WGU C175/D426 DATA MANAGEMENT FOUNDATIONS OA EXAM ACTUAL EXAMS LATEST VERSIONS 300 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (100% CORRECT AND VERIFIED ANSWERS) ALREADY GRADED A+ What does modality refer to? How does it appear on ER diagram? - ANSWER- Refers to the MINIMUM number of times an instance in one entity can be associated with instance of another entity (minima) Appears as a 0 or 1 on the relationship line, next to cardinality Define: Referential Integrity - A...