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Given the following relations TRAIN (NAME, START, DEST) TICKET (PNRNO., START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) Write SQL expressions for the following queries: No
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
courier company er-diagram
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
management information system based on functional organisation
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