WGU Data-Management-Foundations Dumps - Pass WGU Data Management - Foundations Exam in First Attempt 2026

A data type defines the kind of data a column can store in a database. It ensures data consistency and efficient storage.

Option A (Correct): A data type is a named set of values, such as INTEGER, VARCHAR, DATE, etc.

Option B (Incorrect): A tuple refers to a row in a relational database, not a data type.

Option C (Incorrect): Data types define column values, but they do not correspond directly to columns.

Option D (Incorrect): Data types do not have a varying set of rows; they define attributes for columns.

In a one-to-many (1:M) relationship, the foreign key is placed in the table on the 'many' side to establish the relationship with the primary key of the 'one' side.

Example Usage:

CREATE TABLE Departments (

DeptID INT PRIMARY KEY,

DeptName VARCHAR(50)

);

CREATE TABLE Employees (

EmpID INT PRIMARY KEY,

Name VARCHAR(50),

DeptID INT, -- Foreign key on the 'many' side

FOREIGN KEY (DeptID) REFERENCES Departments(DeptID)

);

Each department can have many employees DeptID is a foreign key in Employees.

Why Other Options Are Incorrect:

Option A (Reflexive relationship) (Incorrect): Refers to unary (self-referential) relationships, not 1:M relationships.

Option B (Binary relationship) (Incorrect): A binary relationship involves two entities, but does not define where the foreign key is stored.

Option C (Weak entity) (Incorrect): Weak entities depend on a strong entity, but not all 'many' sides are weak entities.

Thus, the correct answer is Foreign key, as it is placed on the 'many' side of the relationship.

A simple primary key consists of only one column that uniquely identifies each row in a table.

Example Usage:

sql

CREATE TABLE Students (

StudentID INT PRIMARY KEY,

Name VARCHAR(50)

);

StudentID is a simple primary key because it consists of only one field.

Why Other Options Are Incorrect:

Option B (Partition) (Incorrect): Refers to partitioned tables, which divide data for performance reasons but are not related to primary keys.

Option C (Stable) (Incorrect): This is not a recognized term in database keys.

Option D (Meaningless) (Incorrect): Primary keys are often meaningless (e.g., auto-incremented IDs), but this is not a term used to describe their structure.

Thus, the correct answer is Simple, as a single-field primary key is referred to as a simple primary key.

In database design, attributes of an entity become columns in a relational table.

Example Usage:

For an Employee entity, attributes might include:

CREATE TABLE Employees (

EmployeeID INT PRIMARY KEY,

Name VARCHAR(50),

Salary DECIMAL(10,2),

DepartmentID INT

);

Each attribute (e.g., Name, Salary) becomes a column in the table.

Why Other Options Are Incorrect:

Option A (Modality) (Incorrect): Describes optional vs. mandatory relationships, not table structure.

Option B (Uniqueness) (Incorrect): Ensures distinct values but is not a column property.

Option D (Non-null values) (Incorrect): Ensures that columns must contain data but does not define attributes.

Thus, the correct answer is Attribute, as attributes of entities become table columns.

MongoDB is a NoSQL (non-relational) database that is open-source and supports document-oriented storage. It allows for flexible schema design and is optimized for big data applications.

Option A (Correct): MongoDB is a NoSQL database with an open-source AGPL license, making it both free to use and non-relational.

Option B (Incorrect): SQL Server is a relational database (RDBMS) developed by Microsoft and is not open-source.

Option C (Incorrect): MySQL is open-source but is a relational database (RDBMS), not a NoSQL system.

Option D (Incorrect): Oracle Database is relational and proprietary (not open-source).