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WGU D426 ( 2026/2027 Update) Data Management Foundations Exam Guide with Questions and Answers
WGU D426 ( 2026/2027 Update) Data
Management Foundations Exam Guide with
Questions and Answers
Correct
Q: What does SQL stand for?
Answer:
Structured Query Language.
Q: What can SQL statements do?
Answer:
Read and write data, create and delete tables, and administer the database system.
Q: What is big data?
Answer:
Massive volumes of online data, often with poorly structured or missing information.
Q: What is NoSQL?
Answer:
A type of database that does not use the traditional relational model.
Q: What is the relational model?
Answer:
A database model based on tabular data structure.
Q: Who published the relational model?
Answer:
E. F. Codd of IBM.
Q: When was the relational model released in commercial products?
Answer:
Around 1980.
Q: What is big data?
Answer:
Unprecedented data volumes with rapidly changing data structures.
Q: Define a set.
Answer:
An unordered collection of elements enclosed in braces.
Q: Define a tuple.
Answer:
An ordered collection of elements enclosed in parentheses.
Q: What are the components of a table?
Answer:
Name, fixed tuple of columns, and varying set of rows.
Q: What are the components of a column?
Answer:
Name and data type.
Q: Define a row.
Answer:
An unnamed tuple of values corresponding to columns.
Q: What is a data type?
Answer:
A named set of values from which column values are drawn.
Q: What are relational algebra operations?
Answer:
Theoretical foundation of the SQL language.
Q: What are relational rules?
Answer:
Governing rules for data in relational databases.
Q: What are business rules?
Answer:
Rules based on business policy specific to a database.
Q: How are relational rules implemented?
Answer:
As SQL constraints enforced by the database system.
Q: What is SQL?
Answer:
A high-level computer language for storing, manipulating, and retrieving data.
Q: What is an SQL statement?
Answer:
A complete command composed of one or more clauses.
Q: What is a clause in SQL?
Answer:
A group of SQL keywords, table names, column names, and conditions.
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