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In tuple relational calculus P1→ P2 is equivalent to ?
A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning if A then B,is equivalent to ¬A V B)
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
FDs in Relationships: Enrols Relationship: None as it is many to many Teaches Relationship : Course code → Instructor Instructor → Course code The next question is:
need to get answer for questions 3&4 on this page in part 1
Why a report generator is used ? Report generator is used for print files on paper.
what is physical data structure
What is the use of Union and intersection operation? Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuple
how many types of data model in DBMS? explain data abstraction with its different level
In Database software have only pure security or some dis secured by administrator?
Information about films holds information about movies, stars and studios. Movies have a title, year of production, length and the film type. Stars have a name and address. Studi
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