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WGU Data Management – Foundations Exam Sample Questions (Q47-Q52):

NEW QUESTION # 47
What is the last step in the logical design process for designing a database?

A. Analyze data requirements
B. Discover entities
C. Determine cardinality
D. Apply a normal form

Answer: D

Explanation:
Thelogical design phasein database development focuses onstructuring data efficientlyto eliminate redundancy and ensure integrity. Thefinal step in logical designis toapply normalization (normal forms)to optimize the database schema.
Steps in Logical Database Design:
* Discover entities# Identify real-world objects (e.g., Customers, Orders).
* Determine cardinality# Define relationships between entities (one-to-one, one-to-many).
* Analyze data requirements# Determine the attributes each entity needs.
* Apply normal forms# Eliminate redundancy and improve data consistency.
Example Usage:
* After identifying entities likeStudentsandCourses, applying3rd Normal Form (3NF)ensures that data isorganized without redundancy.
Why Other Options Are Incorrect:
* Option A (Analyze data requirements) (Incorrect):Doneearlierto define attributes.
* Option C (Determine cardinality) (Incorrect):Donebeforenormalization to establish relationships.
* Option D (Discover entities) (Incorrect):Done at thebeginningof database design.
Thus, the correct answer isApply a normal form, as normalization is thelast step in logicaldesign.

NEW QUESTION # 48
Which statement uses valid syntax for the DELETE statement in SQL?

A. DELETE FROM table_name;
B. DELETE table_name WHERE condition;
C. DELETE FROM table_name WHERE condition;
D. DELETE * FROM table_name WHERE condition;

Answer: C

Explanation:
Thecorrect syntaxfor deleting records from a table in SQL is:
sql
DELETE FROM table_name WHERE condition;
This deletesonly the rowsthat match the condition.
Example Usage:
sql
DELETE FROM Employees WHERE Salary < 30000;
* Deletesall employees earning less than $30,000.
Why Other Options Are Incorrect:
* Option A (Incorrect):Missing FROMkeyword. The correct syntax is DELETE FROM table_name.
* Option C (Partially Correct):DELETE FROM table_name;deletes all rows, but it lacks a WHERE clause.
* Option D (Incorrect):DELETE *is not validin SQL. The correct command is just DELETE FROM.
Thus, the correct answer isDELETE FROM table_name WHERE condition;.

NEW QUESTION # 49
What is the second step in the implement relationships stage of database design?

A. Implement subtype entities
B. Implement one-one relationships
C. Implement weak entities
D. Specify cascade

Answer: B

Explanation:
Thesecond step in implementing relationshipsis definingone-to-one (1:1) relationshipsbetween entities.
Example Usage:
* Example of a 1:1 relationship:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE EmployeeDetails (
EmpID INT PRIMARY KEY,
Address VARCHAR(255),
FOREIGN KEY (EmpID) REFERENCES Employees(EmpID)
);
* Here, eachemployee has exactly one detail record, creating a1:1 relationship.
Why Other Options Are Incorrect:
* Option A (Implement weak entities) (Incorrect):Weak entities rely on aforeign keyand are implementedlater.
* Option C (Implement subtype entities) (Incorrect):Subtypes arespecial casesandnot implemented in the second step.
* Option D (Specify cascade) (Incorrect):Cascade rules (ON DELETE, ON UPDATE)are defined duringforeign key implementation, not in the second step.
Thus, the correct answer isImplement one-one relationships, as it is thenext logical stepafter defining entities.

NEW QUESTION # 50
Which keyword can be used as a clause in an ALTER TABLE statement?

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

Answer: B

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 # 51
Which syntax feature classifies the explicit string, numeric, or binary values used in SQL queries?

A. Comments
B. Literals
C. Keywords
D. Identifiers

Answer: B

Explanation:
In SQL,literalsrepresent explicit values such asnumbers, strings, or binary datadirectly written into queries.
For example:
SELECT * FROM Employees WHERE Salary > 50000;
Here, 50000 is anumeric literal.
* Option A (Correct):Literalsare explicit values used in SQL queries, such as 123, 'John Doe', and TRUE.
* Option B (Incorrect):Commentsare non-executable text used for documentation within SQL code, typically denoted by -- or /* ... */.
* Option C (Incorrect):Identifiersare names oftables, columns, or other database objects, such as EmployeeID.
* Option D (Incorrect):Keywordsare reserved words in SQL (e.g., SELECT, FROM, WHERE) that define operations and syntax.

NEW QUESTION # 52
......

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