This is personal study note
Copyright and original reference:
https://www.youtube.com/watch?v=E6LbuLoU6rc&list=PLuHgQVnccGMDF6rHsY9qMuJMd295Yk4sa
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"Concept" which is found from real world project by using "conceptual data modeling"
are called "entity"
table=physical_modeling(entity)
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글 entity = 제목 (attribute1), 본문 (attribute2), 생성일 (attribute3)
columns=physical_modeling(attribute1,attribute2,attribute3)
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Analogy:
- Entity (table): directories (which can have subdirectory, and which contains relevant files)
- Attributte (field): files
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Relationship between entities
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In logical data modeling, relationships are represented by "PK, FK",
and tables are concatenated by using "Join"
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