Database - Data Modeling

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56. Which structure is the hierarchical model based

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Option : A
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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

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Option : B
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58. In domain relational calculus we create a variable for every

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Option : B
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59. Why do we have to create a primary index on a primary key

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Option : C
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60. In context with relational Algebra. Which of the following are unary operations. 1.Select 2.Project 3.Union 4.Product

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Option : C
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