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Illustrate the State model for the ATM class
let us take state model for the ATM class given below in Figure showing state model of the ATM class and the pseudo code derived from it. In this method first, we choose the key path of control, this corresponds to the reading of a card querying user for transaction information, processing transaction, printing a receipt and ejecting card. If the customer wants to process for any alternates control that should be provided. Such as if the password entered by the customer is bad then customer is asked to try again.
Control of states and events in ATM
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.
Which database level is closest to the users? External database level is closest to the users.
Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a
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
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
1.Suppose you are given a dataset that consists of a random sample of tasters, on which the following variables were obtained: (y) Zpref = taste preference for green beans store
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
Introductory course and so does not require any fancy coding. I will provide a guidance document to help you in producing the solutions.
Create a Student database and Retrieve the names of all students majoring in ‘CS' Consider the following relational database: STUDENT (name, student#, class, major) COURSE (co
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