WGU D427 Data Management Applications Exam Newest 2026 Questions and Correct Detailed Answers Already Graded A+

WGU D427 Data Management Applications Exam
Newest 2026 Questions and Correct Detailed Answers
Already Graded A+



What is a relational database? - CORRECT ANSWER-A database that stores
data in tables (relations) with rows and columns that can be linked using keys.



What is a table row called? - CORRECT ANSWER-A tuple or record.



What is a table column called? - CORRECT ANSWER-An attribute.



What is a primary key? - CORRECT ANSWER-A column (or columns) that
uniquely identifies each row in a table



Rules:

1. Cannot contain NULL

2. Must be unique



What is a foreign key? - CORRECT ANSWER-A column that references the
primary key of another table to create a relationship.

,What is the basic SELECT syntax? - CORRECT ANSWER-SELECT column1,
column2

FROM TableName;



How do you select all columns? - CORRECT ANSWER-Using the asterisk (*) key
with the SELECT clause.



SELECT *

FROM TableName;



How do you filter the SELECT clause to return only specific criteria? - CORRECT
ANSWER-using the WHERE clause, which comes after the FROM Table clause.




SELECT column

FROM TableName

WHERE condition;



exp:

SELECT CourseName

FROM Course

, WHERE Capacity > 100;



What are the SQL Comparison operators? - CORRECT ANSWER-Operator
Meaning

= Equals

<> or != Not Equal

> Greater Than

< Less Than

>= Greater or Equal

<= Less or Equal



What are the Logical Operators in SQL? - CORRECT ANSWER-AND both
conditions are true

OR One condition is true

NOT Reverses the condition

(T -> F), (F -> T)



How do you check for NULL Value? - CORRECT ANSWER-WHERE column IS
NULL.