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56. Which structure is the hierarchical model based
Tree
Graph
Linked List
None of the above
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57. In the relational model, the number of attributes and number of tuples iri a relation are termed as __________and ______________respectively
Cardinality, domain
Degree, cardinality
Domain degree
Cardinality, degree
58. In domain relational calculus we create a variable for every
Row
Column
Table
59. Why do we have to create a primary index on a primary key
Ease of searching
Sequential ordering of a file
Both (a) and (b)
None of these
60. In context with relational Algebra. Which of the following are unary operations. 1.Select 2.Project 3.Union 4.Product
1 and 3 only
2 and 4 only
1 and 2 only
All are binary
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