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WGU D427 DATA MANAGEMENT APPLICATIONS OA
EXAM AND STUDY GUIDE LATEST 2026 ACTUAL EXAM
400 QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES(VERIFIED ANSWERS)|ALREADY
GRADED A+
Question 1
Which SQL statement retrieves all columns from a table named Employees?
A. GET * FROM Employees;
B. SELECT * FROM Employees;
C. SHOW Employees;
D. DISPLAY * Employees;
Answer: B
Rationale: SELECT * retrieves all columns from a table.
Question 2
Which clause is used to filter records in a SQL query?
A. SORT BY
B. FILTER
C. WHERE
D. GROUP
Answer: C
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Rationale: WHERE specifies conditions for filtering rows.
Question 3
Which SQL statement correctly inserts a new row into a table?
A. ADD INTO Students VALUES (1, 'John');
B. INSERT Students VALUES (1, 'John');
C. INSERT INTO Students VALUES (1, 'John');
D. CREATE ROW Students VALUES (1, 'John');
Answer: C
Rationale: INSERT INTO is the proper syntax for adding rows.
Question 4
Which SQL function returns the total number of rows in a table?
A. SUM()
B. COUNT()
C. TOTAL()
D. NUMBER()
Answer: B
Rationale: COUNT() counts rows or non-null values.
Question 5
Which clause sorts query results in ascending or descending order?
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A. GROUP BY
B. ORDER BY
C. SORT BY
D. FILTER BY
Answer: B
Rationale: ORDER BY sorts query output.
Question 6
Which command removes all rows from a table while keeping the table
structure?
A. DROP TABLE
B. DELETE TABLE
C. REMOVE ALL
D. DELETE FROM
Answer: D
Rationale: DELETE FROM removes records while preserving the table.
Question 7
Which SQL keyword combines rows from two tables based on related columns?
A. MERGE
B. LINK
C. JOIN
D. MATCH
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Answer: C
Rationale: JOIN combines related table data.
Question 8
What is the primary purpose of a primary key?
A. Store duplicate values
B. Encrypt table data
C. Uniquely identify each row
D. Connect databases only
Answer: C
Rationale: Primary keys uniquely identify records.
Question 9
Which JOIN returns matching records from both tables only?
A. LEFT JOIN
B. RIGHT JOIN
C. FULL JOIN
D. INNER JOIN
Answer: D
Rationale: INNER JOIN returns rows with matches in both tables.
pg. 4
WGU D427 DATA MANAGEMENT APPLICATIONS OA
EXAM AND STUDY GUIDE LATEST 2026 ACTUAL EXAM
400 QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES(VERIFIED ANSWERS)|ALREADY
GRADED A+
Question 1
Which SQL statement retrieves all columns from a table named Employees?
A. GET * FROM Employees;
B. SELECT * FROM Employees;
C. SHOW Employees;
D. DISPLAY * Employees;
Answer: B
Rationale: SELECT * retrieves all columns from a table.
Question 2
Which clause is used to filter records in a SQL query?
A. SORT BY
B. FILTER
C. WHERE
D. GROUP
Answer: C
pg. 1
,2|Page
Rationale: WHERE specifies conditions for filtering rows.
Question 3
Which SQL statement correctly inserts a new row into a table?
A. ADD INTO Students VALUES (1, 'John');
B. INSERT Students VALUES (1, 'John');
C. INSERT INTO Students VALUES (1, 'John');
D. CREATE ROW Students VALUES (1, 'John');
Answer: C
Rationale: INSERT INTO is the proper syntax for adding rows.
Question 4
Which SQL function returns the total number of rows in a table?
A. SUM()
B. COUNT()
C. TOTAL()
D. NUMBER()
Answer: B
Rationale: COUNT() counts rows or non-null values.
Question 5
Which clause sorts query results in ascending or descending order?
pg. 2
,3|Page
A. GROUP BY
B. ORDER BY
C. SORT BY
D. FILTER BY
Answer: B
Rationale: ORDER BY sorts query output.
Question 6
Which command removes all rows from a table while keeping the table
structure?
A. DROP TABLE
B. DELETE TABLE
C. REMOVE ALL
D. DELETE FROM
Answer: D
Rationale: DELETE FROM removes records while preserving the table.
Question 7
Which SQL keyword combines rows from two tables based on related columns?
A. MERGE
B. LINK
C. JOIN
D. MATCH
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, 4|Page
Answer: C
Rationale: JOIN combines related table data.
Question 8
What is the primary purpose of a primary key?
A. Store duplicate values
B. Encrypt table data
C. Uniquely identify each row
D. Connect databases only
Answer: C
Rationale: Primary keys uniquely identify records.
Question 9
Which JOIN returns matching records from both tables only?
A. LEFT JOIN
B. RIGHT JOIN
C. FULL JOIN
D. INNER JOIN
Answer: D
Rationale: INNER JOIN returns rows with matches in both tables.
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