WGU Data-Management-Foundations Exam Dumps

The ABS() function in SQL returns the absolute value of a given number, effectively measuring its distance from zero.

Example Usage:

sql

SELECT ABS(-50), ABS(50);

Result:

50 | 50

This function ensures that numbers are always positive, regardless of their original sign.

Why Other Options Are Incorrect:

Option A (CONCAT) (Incorrect): Used to combine strings (not numbers).

Option B (LOWER) (Incorrect): Converts text to lowercase, not numerical operations.

Option C (FROM) (Incorrect): Part of SELECT FROM queries, not a function.

Thus, the correct choice is ABS(), which computes the absolute value of a number.

The CASCADE constraint ensures that updates or deletions in the primary key table automatically reflect in the foreign key table.

Example Usage:

sql

CREATE TABLE Departments (

DeptID INT PRIMARY KEY,

DeptName VARCHAR(50)

);

CREATE TABLE Employees (

EmpID INT PRIMARY KEY,

Name VARCHAR(50),

DeptID INT,

FOREIGN KEY (DeptID) REFERENCES Departments(DeptID) ON UPDATE CASCADE ON DELETE CASCADE

);

If DeptID changes in Departments, it automatically updates in Employees.

If a DeptID is deleted, all employees in that department are also deleted.

Why Other Options Are Incorrect:

Option A (SET DEFAULT) (Incorrect): Sets foreign key values to a default value, rather than propagating changes.

Option B (SET NULL) (Incorrect): When the referenced key is deleted, dependent records are set to NULL instead of being updated/deleted.

Option C (RESTRICT) (Incorrect): Prevents deletion of a referenced row if dependent foreign key rows exist.

Thus, the correct answer is CASCADE, as it propagates primary key changes to dependent foreign keys.

A tangible entity is a real-world object that can be measured and stored in a database.

Example Usage:

In an inventory system, tangible entities include:

Products, Orders, Customers

Why Other Options Are Incorrect:

Option A (Logical entity) (Incorrect): Exists logically but may not have a physical presence (e.g., views, categories).

Option C (Virtual entity) (Incorrect): Exists only in queries or reports, not stored as real data.

Option D (Conceptual entity) (Incorrect): Abstract idea used in design modeling, not a stored entity.

Thus, the correct answer is Tangible entity, as it represents measurable, real-world objects.

In SQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.

Example:

sql

SELECT name, salary FROM Employees;

Option A (Correct): The FROM clause immediately follows the SELECT clause in MySQL.

Option B (Incorrect): VALUE is not a valid clause in MySQL SELECT statements.

Option C (Incorrect): WHERE is used to filter records after specifying the table in FROM.

Option D (Incorrect): TABLE is not a valid clause following SELECT in SQL.

The first step in database analysis is identifying entities, which are the real-world objects that need to be represented in the database.

Example Usage:

In a school system, the main entities could be:

Students, Courses, Instructors

Why Other Options Are Incorrect:

Option A (Determine cardinality) (Incorrect): Determining relationships comes after identifying entities.

Option C (Draw an ER diagram) (Incorrect): ER diagrams visualize entities but are not the first step.

Option D (Implement attributes) (Incorrect): Attributes are defined after entities are identified.

Thus, the correct answer is Identify entities, as entities form the foundation of the database model.