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WGU Data Management – Foundations Exam Sample Questions (Q25-Q30):

NEW QUESTION # 25
Which keyword can be used as a clause in an ALTER TABLE statement?

A. STOP
B. AGGREGATE
C. DELETE
D. CHANGE

Answer: D

Explanation:
TheALTER TABLEstatement is used to modify an existing database table structure. One common clause is CHANGE, which allows renaming a column and modifying its data type.
Example:
sql
ALTER TABLE Employees CHANGE COLUMN OldName NewName VARCHAR(50);
* Option A (Incorrect):DELETE is used to removerows, not alter table structure.
* Option B (Correct):CHANGE is avalid clausefor renaming and modifying columns in MySQL and some other databases.
* Option C (Incorrect):STOP is not a valid SQL keyword for altering tables.
* Option D (Incorrect):AGGREGATE refers to functions like SUM() and AVG(), not table alterations.

NEW QUESTION # 26
Which operator defines the field that the index is using in a CREATE TABLE statement?

A. ON
B. CHECK
C. UNIQUE
D. IN

Answer: A

Explanation:
TheONkeyword specifies the field used by anindexwhen creating it in SQL.
Example Usage:
sql
CREATE INDEX idx_employee_name
ON Employees(Name);
* Here, an indexidx_employee_nameis createdon the Name column.
* Thisimproves query performancewhen filtering by Name.
Why Other Options Are Incorrect:
* Option B (IN) (Incorrect):Used in queries to match values in a set, not for indexing.
* Option C (UNIQUE) (Incorrect):Ensures a column has unique values but doesnot define an index field.
* Option D (CHECK) (Incorrect):Used forvalidating column values, not for indexing.
Thus, the correct answer isON, as it defines thecolumn on which an index is created.

NEW QUESTION # 27
What does the aggregate function do?

A. It lists combinations of rows in two tables.
B. It selects rows that appear in one table but not another.
C. It eliminates one or more columns of a table.
D. It computes values over a set of rows.

Answer: D

Explanation:
Anaggregate functionperforms acalculation over multiple rowsand returns asingle value. Examples include SUM(), AVG(), MAX(), MIN(), and COUNT()in SQL.
* Option A (Correct):Aggregate functions compute values over aset of rows, like summingtotal sales or averaging grades.
* Option B (Incorrect):Selecting rows that appear in one table but not another is done usingset operations (EXCEPT or MINUS in SQL).
* Option C (Incorrect):Eliminating columns is done using thePROJECToperation orSELECT with specific columns.
* Option D (Incorrect):Combining rows from two tables refers to aJOIN operation, not aggregation.

NEW QUESTION # 28
Which function is considered an aggregate function?

A. ABS
B. TRIM
C. DESC
D. MAX

Answer: D

Explanation:
Aggregate functionsperform calculationson a set of values and return asingle result.MAX()is one such function, returning thelargest value in a column.
Common Aggregate Functions:
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Example Usage:
sql
SELECT MAX(Salary) FROM Employees;
* Retrieves thehighest salaryin the Employees table.
Why Other Options Are Incorrect:
* Option B (TRIM) (Incorrect):Removes spaces from strings butis not an aggregate function.
* Option C (ABS) (Incorrect):Returns theabsolute value of a numberbut doesnot aggregate multiple rows.
* Option D (DESC) (Incorrect):Used in ORDER BY forsorting in descending order,not for aggregation.
Thus, the correct answer isMAX(), as it is atrue aggregate function.

NEW QUESTION # 29
Which type of entity only exists in a logical sense?

A. Intangible entity
B. Tangible entity
C. Physical entity
D. Concrete entity

Answer: A

Explanation:
Anintangible entityis an entity that does not have a physical presence but still holds meaning in a database.
These entities representconcepts, relationships, or abstract datathat exist in a logical sense.
Example Usage in Databases:
* Customer Loyalty Status (Gold, Silver, Bronze)
* Theloyalty levelis anintangible entitysince it is derived from other data (purchase history).
* Online User Sessions
* Asession IDexistslogically in the systembut does not have a tangible presence like a product or employee.
Why Other Options Are Incorrect:
* Option A (Concrete entity) (Incorrect):No such formal term in database design.
* Option B (Tangible entity) (Incorrect):Represents somethingphysical, like anemployeeorproduct.
* Option D (Physical entity) (Incorrect):Refers todata stored on disk, like database tables or indexes.
Thus, the correct answer isIntangible entity, as it only exists in a logical sense within the database.

NEW QUESTION # 30
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