数据库系统基础教程第四章答案(10)
时间：2025-04-20
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4.1.9
Assumptions
A Professor only works in at most one department.
A course has at most one TA.
A course is only taught by one professor and offered by one department.
Students and professors have been assigned unique email ids.
A course is uniquely identified by the course no, section no, and semester (e.g. cs157-3 spring
09).
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