University of California, Berkeley Data Management Class Set 2

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University of California, Berkeley *

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140

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Computer Science

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Dec 6, 2023

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University of California, Berkeley Data Management Class - Additional Sample Questions and Answers Set 2 Q1. What are the principles of effective data visualization? A1. Effective data visualization should be clear, accurate, efficient, and tailored to the target audience. It should present data in a way that is easy to understand and interpret, avoiding misleading representations. The choice of visualization (like charts, graphs, maps) should align with the nature of the data and the information one aims to convey. Q2. What is a primary key in a database? A2. A primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). A primary key’s main features are: it must contain unique values, and it cannot contain NULL values. Q3. What is Big Data and its characteristics? A3. Big Data refers to extremely large data sets that may be analyzed computationally to reveal patterns, trends, and associations, especially relating to human behavior and interactions. Its main characteristics are often described by the four Vs: Volume (large amounts of data), Velocity (high speed of data generation and processing), Variety (different types of data), and Veracity (uncertainty of data).
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