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Discuss the problem of Spurious tuples and how we may prevent it.
Ans: A spurious tuple is, mainly, a record in a database that gets created while two tables are joined badly. In database-ese, spurious tuples are formed while two tables are joined on attributes which are neither primary keys nor foreign keys. To prevent spurious tuples, avoid joining relations that consist of matching attributes that are not (foreign key, primary key) combinations as joining on such attributes may generate spurious tuples.
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
Question 1 Explain the 10 reasons to use MySQL Question 2 Write the SQL statements to demonstrate the following using SELECT command Expression Evaluation ORDER BY
vertical fragmentation
Define the terms entity, attribute, role and relationship between the entities, giving examples for each of them. Ans: Entity: An entity is a "thing" or "object" in th
Explain trivial dependency? Functional dependency of the form α ->β. is trivial if α C β. Trivial functional dependencies are satisfied by all the relations.
Problem: (a) Given the following relation: Stats(Name,Sex,Children, Occupation, Salary, Tax, Audits) Write SQL code to define the following security constraints: (i) User
Define what Immediate database modification technique uses? Ans: Both undo and redo.
a. Construct a query around any one of the functional divisions you made in 4a such that if executed in the distributed design of 4 would require reconstruction of at least two ho
In which form of relational database developer refers to a record? In a tuple form of relational database developer refers to a record.
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
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