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Relational Data and Relationships
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Computer Science
HSCS.206 Relational Data and Relationships
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A document system stores version history. One document can have many versions, and each version belongs to one document. Which schema avoids overwriting earlier versions?
A
Documents(document_id PK, title, version1_hash, version2_hash, version3_hash)
B
Documents(document_id PK, title, current_content_hash) only, replacing it each time
C
Documents(document_id PK, title, owner_id FK); DocumentVersions(version_id PK, document_id FK, version_number, saved_at, content_hash)
D
DocumentVersions(version_id PK, document_title, owner_id, version_number, saved_at) with document data copied and no document_id
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