Which of the following statements on tuple and document stores is correct?

Question

BlackTom AI · Accepted Answer

Document-oriented stores allow the record key to be represented as a field inside the stored document, so the key can indeed be put in one of the attributes.

1. Relevant knowledge points and concepts
- Key-value stores use an external key paired with an opaque value; queries are by key only.  
- Document stores (a class of NoSQL databases) hold structured documents (commonly JSON/BSON/XML) where fields are accessible and queryable.  
- Document stores support indexes on document fields and richer query APIs (filters, projections, nested-field queries).  
- Implementation formats vary (JSON, BSON, XML, binary), so “always JSON” is incorrect.

2. Step-by-step reasoning
- If a database stores whole documents with named attributes, one of those attributes can be used to contain the identifier. Many document stores either require or allow a special attribute (e.g., MongoDB’s _id) to act as the primary key.  
- Because the key is part of the document, queries can address the document by that attribute as well as use it in indexes and queries.

3. Intermediate factual steps (no numeric calculations)
- Example: MongoDB stores BSON documents and uses the _id field inside each document as the document’s primary key; CouchDB uses a document’s id stored as _id in the JSON document.  
- Indexes can be defined on any attribute, including the attribute holding the key.

4. Why the correct answer is correct
- “The key can be put in one of the attributes” matches how document stores operate: the document contains fields, one of which can serve as the key. This is standard behavior in tuple/document-oriented systems.

5. Why the other options are incorrect
- “It has a less rich API than a key-value store”: false — document stores generally provide richer query APIs than simple key-value stores.  
- “Document stores are always implemented using JSON”: false — implementations include BSON (MongoDB), JSON (CouchDB), XML, or other formats.  
- “Indices are not possible to define”: false — most document stores allow defining indexes on document attributes.

6. Conclusion
The correct choice is: The key can be put in one of the attributes. This matches common document-store behavior and confirms the provided answer.

Which of the following statements on tuple and document stores is correct? 单项选择题

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