Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Domain contraints,”Attributes must be of[…]
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Referential Integrity Constraints,”Every value in a foreign key must have a corresponding
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Referential Integrity Constraints,”Every value in[…]
Read moreT/F? ER’s have foreign keys
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Read moreT/F? Candidate keys can have multiple columns
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Read moreRelational schemas,”Conceptual frame work and actual framework that it is able to be implemented. Ex. PROFESSOR(ProfID, Name
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Relational schemas,”Conceptual frame work and[…]
Read moreMapping Relational Schemas,”Typically entities are mapped first
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Mapping Relational Schemas,”Typically entities are[…]
Read moreMapping Binary 1:M Relationships,”To complete the mapping we must include the relationship by adding a foreign key:PROFESSOR(ProfID, Name, Dept)COURSE(CourseID, Topic, Title
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Mapping Binary 1:M Relationships,”To complete[…]
Read moreMapping Binary 1:1 Relationships,”A binary 1:1 relationship is mapped much like a binary 1:M relationship, except the placement of the foreign key is somewhat arbitraryEx. (can have null)PROFESSOR(ProfID, Name, Dept, SerialNum)LAPTOP(SerialNum, Model, OS)or (better/ no null)PROFESSOR(ProfID, Name, Dept)LAPTOP(SerialNum, Model, OS
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Mapping Binary 1:1 Relationships,”A binary[…]
Read moreMapping Binary M:N Relationships,”A binary M:N cannot be mapped directly into relations without creating an intersection relation (aka association table, junction table, etc.)Ex. STUDENT(StudentID, Name, Major, Year)COURSE(CourseID, Title, Topic)ENROLLS(StudentID, CourseID
Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review.Mapping Binary M:N Relationships,”A binary[…]
Read moreEntity intergrity
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