Latest WGU Data-Management-Foundations D426 Practice Questions By Page

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.

A query processor is responsible for query optimization and execution in a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.

Option A (Correct): The query processor optimizes queries by analyzing metadata from the system catalog to determine the best execution strategy.

Option B (Incorrect): Logging transactions before applying changes is the responsibility of the transaction manager.

Option C (Incorrect): Translating instructions into file system commands is handled by the storage manager, not the query processor.

Option D (Incorrect): While the query processor helps retrieve results, the database engine and API layer are responsible for returning results to applications.