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Describe the two alternatives for specifying structural constraints on relationship kinds? Relationship kinds have certain constraints in which limit the possible combination o
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Question: (a) Why is it important to know the architecture rather than to start requirement capture when designing a large scale system? (b) Who are the different people in
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
Failure Controlling Methods: Failures can be handled using different recovery methods that are talk about later in the unit. But the first question is doing we really require recov
what are the reasons having variable length records
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
For problems 1-4, give all candidate keys for the tables with FDs specified. Composite candidate keys must be put in parentheses, and candidate keys must be separated with commas
what is inverted and multilist structure
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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