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Explain the Aggregation implies concurrency Concurrency actually is: This in objects can be identified by the way they change state. Present objects can change state independen
Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if: 1.1 The only key is A1. 1.2 The only key is A1 and A2. 1.3 The o
Define Network DBMS The NDBMS is built primarily on a one-to-many relationship, but where a parent-child representation between the data items cannot be ensured. This may occur
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
create an e-r diagram usuing graphical dipicted software that could theoritically be used in resturant application
What is meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
what is relationship inheritance and attribute inheritance
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied. Ans
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