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WGU Data Management – Foundations Exam Sample Questions (Q11-Q16):
NEW QUESTION # 11
Which keyword can be used as a clause in an ALTER TABLE statement?
- A. DELETE
- B. AGGREGATE
- C. STOP
- 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 # 12
Which SQL command uses the correct syntax to add a new employee "John Doe" to the Employee table?
- A. INSERT INTO Employee (Name) VALUES ("John Doe");
- B. INSERT Employee (Name) Values ("John Doe");
- C. INSERT Employee { "John Doe" };
- D. INSERT INTO Employee ("John Doe");
Answer: A
Explanation:
Thecorrect syntaxfor inserting a new row into a table follows this structure:
Standard SQL INSERT Syntax:
sql
INSERT INTO TableName (Column1, Column2, ...)
VALUES (Value1, Value2, ...);
For this scenario:
sql
INSERT INTO Employee (Name) VALUES ('John Doe');
Why Other Options Are Incorrect:
* Option A (Incorrect):Uses incorrect syntax { ... }, which isnot valid SQL syntax.
* Option C (Incorrect):Does not specify the column name, whichcauses an error.
* Option D (Incorrect):Misses theINTOkeyword, which is required in standard SQL.
Thus, the correct syntax isOption B, ensuring aproperly formatted insert statement.
NEW QUESTION # 13
Which property is associated with a one-field primary key?
- A. Numeric
- B. Composite
- C. Simple
- D. Duplicate
Answer: C
Explanation:
Aprimary keyuniquely identifies each row in a table. When a primary key consists ofonly one field, it is called aSimple Primary Key.
Types of Primary Keys:
* Simple Primary Key (Correct Answer):
* Contains onlyone column.
* Example:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* Composite Primary Key:
* Usesmultiple columnsto ensure uniqueness.
* Example:
sql
CREATE TABLE Orders (
OrderID INT,
ProductID INT,
PRIMARY KEY (OrderID, ProductID)
);
* Surrogate Primary Key:
* A system-generatedunique identifier(e.g., UUID or AUTO_INCREMENT).
Why Other Options Are Incorrect:
* Option B (Duplicate) (Incorrect):A primary keymust be unique, so itcannot be duplicate.
* Option C (Numeric) (Incorrect):While primary keyscan be numeric, they can also be alphanumeric (VARCHAR).
* Option D (Composite) (Incorrect):Acompositekey consists ofmultiple fields, whereas a simple key is a single field.
Thus, the correct answer isSimple, since aone-field primary keyis a simple primary key.
NEW QUESTION # 14
Which action does the % operator accomplish in MySQL?
- A. Divides two numeric values and returns the remainder
- B. Compares two numeric values for equality
- C. Subtracts a numeric value from another
- D. Raises a numeric value to the power of another
Answer: A
Explanation:
The % operator in MySQL is known as themodulus operator. It returns theremainderof a division operation between two numbers.
Example:
sql
SELECT 10 % 3; -- Output: 1 (10 divided by 3 gives remainder 1)
* Option A (Incorrect):Raising a number to a power is done using the POW() function or
