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- country_id (PK)
- country_name
- district_id (PK)
- district_name
- country_id (FK countries(country_id))
- subject_id (PK)
- subject_name
- district_id (FK districts(district_id))
- country_id (FK countries(country_id))
- city_id (PK)
- city_name
- subject_id (FK subjects(subject_id ))
- district_id (FK countries(district_id))
- country_id (FK countries(country_id))
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