DA0-002 Data Concepts and Environments Practice Question
In a customer database, each row represents a customer with columns: CustomerID, Name, Address, Phone. What does the column "Name" represent?
⚠ Common exam trap
Candidates often confuse 'attribute' with 'record' because they think of a row as containing all attributes, but the question specifically asks what a single column represents, not the row itself.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attribute
In the context of a relational database, a column represents an attribute of an entity. The 'Name' column stores a specific characteristic (the customer's name) for each row, making it an attribute. This aligns with the data modeling concept where attributes define the properties of an entity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Instance
Why it's wrong here
An instance is a single occurrence of an entity, corresponding to one row such as one specific customer, not a column. Name is an attribute whose value varies across instances, so it describes rather than constitutes an instance.
- ✗
Entity
Why it's wrong here
An entity is the real-world object or concept about which data is stored, such as the customer itself, not one of its descriptive properties. Name is an attribute of the Customer entity, holding a value that describes each instance.
- ✓
Attribute
Why this is correct
Name is an attribute: a column describing a characteristic of the customer entity, whose rows are instances. It satisfies the stem's requirement by identifying the property recorded for each CustomerID, distinct from the entity itself.
- ✗
Record
Why it's wrong here
"Name" holds a single attribute value within a row, whereas a record is the entire row comprising CustomerID, Name, Address and Phone. The term tempts because records and fields are both row-level concepts, and "record" would be the right answer if the question asked what a complete customer entry represents.
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