WGU D426 (Latest 2026/2027 Update) Data Management Foundations Exam| Guide with Questions and Verified Answers|100% Correct| Grade A

WGU D426 (Latest 2026/2027 Update) Data Management Foundations Exam| Guide with Questions and Verified Answers|100% Correct| Grade A

WGU D426 (Latest 2026/2027 Update) Data

Management Foundations Exam| Guide with

Questions and Verified Answers|100%

Correct| Grade A

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.