WGU D427 Data Management – Applications 2026 | Updated Pre-Assessment Test Questions & Answers

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WGU - D427 - Data Management -
Applications – Pre Assessment Test Guide
2026 Updated
San Francisco, CA 94110
USA
How many attributes are present in the address fragment?
-1
-2
-3
-4
4
The Package table has the following columns:
Weight—decimal
Description—optional variable length string
LastChangedDate—date
TrackingNumber—integer
Which column should be designated the primary key for the Package table?
- Weight
- Description
- LastChangedDate
- TrackingNumber
Tracking Number
Which data type will store "2022-01-10 14:22:12" as a temporal value without loss
of information?
- DATE
- DATETIME
- DECIMAL
- BIGINT
DATETIME
Which SQL command is an example of data definition language (DDL)?
- UPDATE
- ALTER
- SELECT
- DELETE
CREATE, ALTER, OR DROP
How would a database engine process an update that violates a RESTRICT
referential integrity constraint?
- The offending value would be set to the database default.
- The update would be rejected by the database.
- The offending value would be changed to NULL.
- The updated value would flow to the primary key.

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The update would be rejected by the database.
Which restriction applies when using a materialized view?
- The users of the view must provide search terms.
- The underlying data must be periodically refreshed.
- The tables referenced in the view must be indexed.
- The rows in the table must be compressed.
The underlying data must be periodically refreshed.
Which query illustrates performing an outer join of the Movie table with a different
table?
- SELECT M.Title, A.Actor FROM Movie M, Actor A
WHERE M.ActorID = A.ID
- SELECT M.Title, A.Actor FROM Movie M
LEFT JOIN Movie MB ON M.ID, Actor A
- SELECT M.Title, A.Actor FROM Movie M
RIGHT JOIN Actor A ON M.ActorID = A.Id
- SELECT M.Title, A.Actor FROM Movie M
INNER JOIN Actor A ON M.ActorID = A.ID
SELECT M.Title, A.Actor FROM Movie M
LEFT JOIN Movie MB ON M.ID Actor A
Assume there are two tables, A and B.
Which rows will always be included in the result set if Table A is inner joined with
Table B?
- Only rows in Tables A and B that share the join condition
- all rows in Table B
- All rows in Table A
- Only rows in Tables A and B that do not share the join condition
Only rows in Table A and B that share the join condition
1. Portland, OR 97212
How many attributes are present in the address fragment?

-1
-2
-3
-4
3
2. The Patient table has the following columns:

first_name varchar(20)
last_name varchar (30)
birthdate date
patient_id int

Which column should be designated as the primary key for the Patient table?

- first_name
- last_name

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- birthdate
- patient_id
patient_id
3. The Exam table has the following columns:
exam_id int
exam_date date
exam_reason varchar(100)
patient_number int

Which column should be designated as the foreign key for the Exam table?

- exam_id
- exam_date
- exam_reason
- patient_id
patient_id
4. Which data type represents numbers with fractional values:

- varchar
- integer
- binary
- decimal
decimal
5. Which of the following is a DDL (Data Definition Language) command?

- INSERT
- SELECT
- CREATE INDEX
- UPDATE
CREATE INDEX

CREATE, ALTER, DROP
6. Which of the following is a DML (Data Manipulation Language) command?

- CREATE VIEW
- CREATE TABLE
- INSERT
- ALTER INDEX
INSERT
7. Patient Table
PK patient id
first name
last name
birthdate

Exam Table