1. In a database environment, a 'record' is equivalent to which of the following terms?" i. Tuple ii. Row iii. Attribute iv. Entity instance

Question

BlackTom AI · Accepted Answer

The correct answer is B because a "record" in relational databases is synonymous with a tuple, a row, and an entity instance, but not with an attribute.

1. Relevant knowledge points and concepts
- Tuple: In relational theory, a tuple is an ordered set of attribute values; it represents one entry in a relation (table).  
- Row: A row is the common, informal term for a single horizontal record in a table — equivalent to a tuple.  
- Attribute: An attribute is a column or a property of the entity (a single field), not a whole record.  
- Entity instance: In an entity–relationship context, an entity instance is a concrete occurrence of an entity type, which corresponds to one record/row in the table representing that entity.

2. Step-by-step reasoning
- A record holds all attribute values for one item (e.g., one customer).  
- In relational model terms, that one item is a tuple (the formal name).  
- In practical database UI and SQL terms, the same item is called a row.  
- In ER modeling, the same concrete item is called an entity instance. Therefore record = tuple = row = entity instance.

3. Intermediate steps / mapping
- Table (relation) = set of tuples.  
- One tuple = horizontal collection of attribute values.  
- One row = one tuple (same thing, different terminology).  
- One entity instance = one record in the table modeling that entity.

4. Why the correct answer is correct
- Options i (tuple), ii (row), and iv (entity instance) all refer to the same concept: one full set of attribute values representing a single occurrence. Thus i, ii and iv are equivalent to "record."

5. Why other options are incorrect
- Option a (i, iii and iv) incorrectly includes iii (attribute), which is a single column/value, not a whole record.  
- Option c (i and ii) omits iv (entity instance), which is also equivalent and should be included.  
- Option d (all of the above) incorrectly equates attribute with record.

6. Conclusion
- Therefore, the correct choice is b. i, ii and iv, which matches the provided answer.

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1. In a database environment, a 'record' is equivalent to which of the following terms?" i. Tuple ii. Row iii. Attribute iv. Entity instance单项选择题

类似问题

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Question at position 18 A _____ contains the value of an attribute describing a specific object or entity. A _____ contains the value of an attribute describing a specific object or entity. columncellrowtableClear my selection

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希望你的学习变得更简单

Question at position 18 A _ contains the value of an attribute describing a specific object or entity. A _ contains the value of an attribute describing a specific object or entity. columncellrowtableClear my selection