WGU D427 DATA MANAGEMENT APPLICATIONS OBJECTIVE ASSESSMENT ACTUAL EXAM 2025/2026 QUESTIONS WITH VERIFIED CORRECT SOLUTIONS || 100% GUARANTEED PASS BRAND NEW VERSION

WGU D427 DATA MANAGEMENT APPLICATIONS OBJECTIVE ASSESSMENT ACTUAL EXAM 2025/2026 QUESTIONS WITH VERIFIED CORRECT SOLUTIONS || 100% GUARANTEED PASS BRAND NEW VERSION 1. Write a SELECT statement to show a list of all employees' first names and their managers' first names. List only employees that have a manager. Order the results by Employee first name. Use aliases to give the result columns distinctly different names, like "Employee" and "Manager". The Employee table has the following columns: ID - integer, primary key FirstName - variable-length string LastName - variable-length string ManagerID - integer - ANSWER SELECT DISTINCT name as employee, name as manager FROM employee AS e INNER JOIN employee AS m ON = erid ORDER BY name ASC; 2. Write a SELECT statement to create a lesson schedule with the lesson date/time, horse ID, and the student's first and last names. Order the results in ascending order by lesson date/time, then by horse ID. Unassigned lesson times (student ID is NULL) should not appear in the schedule. Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key - ANSWER SELECT LessonDateTime, HorseID, FirstName, LastName FROM lessonschedule INNER JOIN student ON studentid = id ORDER BY lessondatetime, horseid ASC; 3. Write a SELECT statement to create a lesson schedule for Feb 1, 2020 with the lesson date/time, student's first and last names, and the horse's registered name. Order the results in ascending order by lesson date/time, then by the horse's registered name. Make sure unassigned lesson times (student ID is NULL) appear in the results. Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key - ANSWER SELECT ndatetime, name, ame, teredname FROM lessonschedule LEFT JOIN student ON ntid = LEFT JOIN horse ON id = WHERE date(ndatetime) = '' ORDER BY ndatetime ASC, teredname ASC; 2.14 LAB - Select tall horses with subquery The Horse table has the following columns: ID - integer, primary key RegisteredName - variable-length string Breed - variable-length string Height - decimal number BirthDate - date 4. Write a SELECT statement to select the registered name and height for only horses that have an above average height. Order the results by height (ascending). - ANSWER SELECT registeredname, height FROM horse WHERE height ( SELECT AVG(height) FROM horse) ORDER BY height ASC; 5. Which SQL statement is used to remove rows of data from a database? - ANSWER DELETE 6. What is the purpose of the ON clause in SQL joins? - ANSWER Specifies the condition for the join between the two tables 7. Which of the following best describes a strong entity? - ANSWER An entity that has a unique identifying attribute 8. The LIKE operator is used to: - ANSWER Search for a specified pattern in a column 9. To find the number of non-NULL rows in a column, you would use: - ANSWER COUNT() 10.Which statement about NoSQL databases is true? - ANSWER They are optimized for big data 11.In ER modeling, what describes the relationship between a salesperson and an office space/cubicle? - ANSWER One-to-One 12.In which type of table is no specific order imposed on rows? - ANSWER Heap table 13.Which symbol represents a one-to-many relationship in ER Diagrams? - ANSWER A crow's foot 14.Which SQL function returns the current date? - ANSWER CURDATE() 15.How are weak entities represented in an ER Diagram? - ANSWER With a double rectangle 16.Which SQL clause is used to filter rows in a SELECT statement? - ANSWER WHERE 17.What is a binary relationship in ER modeling? - ANSWER A relationship between two entity types 18.Which layer of MySQL architecture manages connections from multiple users? - ANSWER Query processor 19.Which of the following is NOT a characteristic of column-oriented storage? - ANSWER Performs best for transactional applications 20.What represents a relationship in an ER Diagram? - ANSWER A line connecting entities 21.What is intersection data in an ER Diagram? - ANSWER Data that describes the relationship between two entities 22.Consider the following database table Order with the following columns: OrderID (Primary Key) CustomerID CustomerName OrderDate ProductID ProductName Quantity Which of the following normal forms does the Order table currently satisfy IF: 1) Each OrderID has a unique value (i.e. is a primary key) 2) Each entry in the table is atomic (no repeating groups or arrays). - ANSWER First Normal Form 23.Synonyms for TABLE - ANSWER MATH: Relation Files: File 24.Synonyms for COLUMN - ANSWER MATH: Attribute FILE: Field 25.Synonyms for ROW - ANSWER MATH: Tuple FILE: Record 26.Synonyms for DATA TYPE - ANSWER MATH: Domain FILE: Data Type :) 27.What language defines the structure of the database. AKA deals with tables - ANSWER DDL 28.What language retrieves data from the database. - ANSWER DQL 29.What language manipulates data stored in a database. AKA deals with rows - ANSWER DML 30.What language controls database user access. - ANSWER DCL 31.What language manages database transactions - ANSWER DTL 32.INNER JOIN - ANSWER selects only matching left and right table rows 33.FULL JOIN - ANSWER selects all left and right table rows, regardless of match 34.FROM clause - ANSWER specifies the left table 35.INNER JOIN or FULL JOIN clause - ANSWER specifies the right table 36.ON clause - ANSWER specifies the join column 37.LEFT JOIN - ANSWER selects all left table rows, but only matching right table rows