Consider the relation R(P,Q,S,T,X,Y,Z,W) with the following functional dependencies. PQ → X;
Which one of the following options is correct?
Suppose a database system crashes again while recovering from a previous crash. Assume checkpointing is not done by the database e…
The following relation records the age of 500 employees of a company, where empNo (indicating the employee number) is the key: emp…
Let ri(z) and wi(z) denote read and write operations respectively on a data item z by a transaction Ti. Consider the following two…
Consider the following statements S1 and S2 about the relational data model: S1: A relation scheme can have at most one foreign ke…
A data file consisting of 1,50,000 student-records is stored on a hard disk with block size of 4096 bytes. The data file is sorted…
The relation scheme given below is used to store information about the employees of a company, where empId is the key and deptId i…
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