Introduction to Data and Databases
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Questions and Answers

What is a consequence of leaving fields empty?

  • Empty fields save memory space.
  • Empty fields enhance system performance.
  • Empty fields occupy memory. (correct)
  • Empty fields are automatically filled later.

Why is it important not to have empty fields?

  • They can lead to higher processing speed.
  • They may interfere with data retrieval.
  • They take up unnecessary memory space. (correct)
  • They help in organizing data effectively.

What should one consider when adding fields?

  • Having empty fields is acceptable in large datasets.
  • Always leave some fields empty for flexibility.
  • All fields should be filled to optimize memory usage. (correct)
  • Fields can be added without considering their content.

Which of the following statements about fields is false?

<p>Empty fields can enhance data security. (D)</p> Signup and view all the answers

What is a recommended practice when managing fields?

<p>Fill every field to prevent memory issues. (D)</p> Signup and view all the answers

What is an entity?

<p>An item for which we want to store information (C)</p> Signup and view all the answers

Which of the following is an example of a tangible entity?

<p>A specific student like Colin Cherry (D)</p> Signup and view all the answers

What type of entity is a sale considered to be?

<p>Intangible (D)</p> Signup and view all the answers

What defines an attribute in the context of entities?

<p>Descriptive information about an entity (D)</p> Signup and view all the answers

Which of the following statements is true regarding entities?

<p>An instance of an entity is a specific example of that entity. (D)</p> Signup and view all the answers

What is the purpose of having a student table in a database?

<p>To organize student-related data (D)</p> Signup and view all the answers

Why is a separate course table necessary in a database?

<p>To maintain a list of available courses (A)</p> Signup and view all the answers

What type of relationship exists between the student and course tables?

<p>Many-to-Many (A)</p> Signup and view all the answers

What is a benefit of using separate tables for different entities in a database?

<p>It reduces redundancy of data (A)</p> Signup and view all the answers

What might be a reason against using a single table for both students and courses?

<p>It can create confusion in data structure (B)</p> Signup and view all the answers

What is big data primarily used for?

<p>Extracting useful information from vast amounts of ill-defined data (D)</p> Signup and view all the answers

What is a sample in the context of big data?

<p>A randomly selected subset of the total data (C)</p> Signup and view all the answers

What challenge does data processing in big data often face?

<p>It can be complicated and time-consuming (D)</p> Signup and view all the answers

Which of the following describes the nature of big data?

<p>It encompasses a large variety of unstructured and ill-defined data (D)</p> Signup and view all the answers

Why is scanning a subset of data called a sample?

<p>Because it provides a manageable portion of the total data to analyze (C)</p> Signup and view all the answers

What is unstructured data primarily characterized by?

<p>The absence of a predefined model (C)</p> Signup and view all the answers

Which of the following is an example of human-generated content?

<p>Business documents (B)</p> Signup and view all the answers

What is the main purpose of sampling in data analysis?

<p>To improve data quality at the expense of volume (B)</p> Signup and view all the answers

Which statement is NOT true about unstructured data?

<p>It is always low in quality (B)</p> Signup and view all the answers

Which of the following accurately describes the relationship between data volume and data quality when sampling is applied?

<p>Sampling typically reduces data volume while enhancing quality (B)</p> Signup and view all the answers

What does data science primarily rely on to derive meaningful insights from data?

<p>Domain expertise, programming skills, and knowledge of mathematics and statistics (C)</p> Signup and view all the answers

Which combination of skills is essential for someone working in data science?

<p>Domain expertise and statistical knowledge (B)</p> Signup and view all the answers

Which aspect is NOT part of data science according to its definition?

<p>Abstract reasoning (A)</p> Signup and view all the answers

Data science combines which of the following disciplines?

<p>Domain expertise, programming, and knowledge of mathematics (D)</p> Signup and view all the answers

What is the ultimate goal of data science?

<p>To extract meaningful insights from data (B)</p> Signup and view all the answers

Flashcards

Adding many fields

It's possible to add a large number of fields to a system.

Empty fields

Unfilled or blank fields are problematic.

Fields & memory

Empty fields consume storage space needlessly.

Entities in a Database

Represent real-world objects or concepts, like students and courses.

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Entity

Something we want to store information about, which can be tangible (like a person or object), intangible (like an event), or a concept (like a bank account).

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Database Tables

Store data about an entity, organizing related information within rows and columns.

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Tangible Entity

A physical, real-world object or person.

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Student Table

Holds data about students. Example: student ID, name, address.

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Intangible Entity

Something abstract or not physical, like an event.

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Attribute

Descriptive information about an entity. Tells something about the entity.

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Course Table

Contains details about courses. Example: course ID, name, description.

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Entity-Relationship

The connection between entities in a database. Ex: students taking courses.

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Instance

particular example or member of an entity.

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Example of Entity

'student', 'sale' and 'bank account' are all examples of entities.

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Big data

A data-handling technology that extracts useful information from large amounts of unstructured data.

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Data processing

The process of finding information in a large data pool.

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Sample

A subset of data used to speed up data processing.

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Unstructured data

Data without a pre-defined format, lacking clear structure for easy processing.

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Data handling technology

A method or system to process and manage large quantities of data.

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Data Science Definition

Data science uses expertise, coding, and math/stats to find useful information from data.

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Unstructured Data

Data that doesn't have a predefined format or structure, and is created by both computers and humans (e.g. images, documents, email).

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Big Data

Deals with and processes large volumes of unstructured information.

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Data Volume vs. Quality

Sampling can improve data quality, but sometimes reduces overall data volume.

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Sampling

Technique used to select a representative subset of data to improve quality, even if it compromises volume.

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Unstructured Data Sources

Includes machine-generated data like satellite images and human-generated content like business documents and emails.

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Study Notes

Data

  • Data comes in various forms: numbers, characters, text, pictures, and sounds.
  • Crucially, data lacks context, making it difficult to understand its meaning.
  • Computer programs process data by following instructions.
  • Data transforms into information when structure is imposed to make it meaningful.
  • Data is one or more values that can be assigned to an object. Examples include names, prices, and titles of books/movies.
  • Objects can be physical (e.g., mountains, people, cities) or virtual (e.g., characters in novels, weather forecasts).

Databases

  • Databases are organized collections of related data, allowing computers to access and update information.
  • Databases played a major role in the computerization of businesses and government.
  • IBM's SABRE (Semi-Automatic Business Research Environment) was an early example of a real-time database, providing fast responses to inquiries.

Flat Databases

  • Flat databases, like spreadsheets, can calculate totals, generate statistics, and process data using equations to generate new values.
  • They can store more than just numbers. They also store text and other types of data.
  • Data in flat databases is all in one table.

Relational Databases

  • Relational databases solve problems of repeated data by dividing data into multiple tables.
  • This separation, called normalization, follows rules like one table per entity.
  • An entity is something you want to store information about (people, items, objects or concepts like bank accounts).
  • Attributes are descriptive information about an entity (e.g., a student's name, age, address).
  • Relational databases link tables using joining tables or key values to show relationships between entities.

Big Data

  • Big data is a set of techniques to extract information from large, complex datasets.
  • Big data is processed using computer networks to analyze large volumes of diverse data at high velocities in a reliable way to ensure trustworthy information.
  • Data in databases is typically structured, while big data may include unstructured data.

Data Types

  • Text data includes any combination of text, numbers, and symbols.
  • Numbers are a data type representing numerical values.
  • Data and time capture date and time information.
  • Currency represents monetary values.
  • Logical data represents True or False values .

Data Science

  • Data science is a multidisciplinary field that combines domain expertise, programming skills, and mathematical/statistical knowledge.
  • It uses scientific methods to extract knowledge and insights from structured and unstructured data.
  • Data science can clean, prepare, and analyze data for greater insights; important skills include knowledge of Python, SAS, R, and SCALA along with SQL coding.

Data Processing Techniques

  • Sampling is used to improve the quality of data while reducing the volume of data processed.
  • Cluster computing uses a network of computers to process large datasets simultaneously. These computers (nodes), work together on small parts of the larger problem.

Data Uses

  • Big data is now used to perform various tasks, such as monitoring people for fraud, and analyzing large amounts of activity data from various sources.

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Ch4 PDF - Database Concepts

Description

This quiz covers the fundamental concepts of data and databases, including the definition of data, its various forms, and how databases organize and manage related information. It also discusses the significance of databases in modern business and government operations. Test your understanding of these essential topics!

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