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Computer Science — Tanzania — free MCQ practice

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Computer Science — Tanzania subjects

Computer Science (30)

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Computer ScienceDatabase ManagementDatabasesInformation SystemsRelational DatabasesSQL

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A system storing related data elements in row-based tables is called an:Read the answer and worked solution →The relational model of data was first proposed at IBM Research in 1970 by:Read the answer and worked solution →In that model, a relation is a mathematical concept based on the idea of:Read the answer and worked solution →A minimal group of attributes that uniquely identifies each row is a:Read the answer and worked solution →

Worked practice questions

A system storing related data elements in row-based tables is called an:

  1. RDBMS
  2. RSVPS
  3. RFIDS
  4. RTOSS
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Correct answer: A. RDBMS

1. The data sits in tables made of rows and columns. 2. A management system controls those tables. 3. That system is an RDBMS. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._

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The relational model of data was first proposed at IBM Research in 1970 by:

  1. Craik
  2. Codd
  3. Cobol
  4. Cabot
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Correct answer: B. Codd

1. The model rests on the mathematics of sets. 2. One researcher set it out formally. 3. That researcher was Edgar F. Codd. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._

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In that model, a relation is a mathematical concept based on the idea of:

  1. Sets
  2. Sums
  3. Signs
  4. Slots
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Correct answer: A. Sets

1. A table has no inherent row order. 2. Its rows behave like members of a collection. 3. So a relation is based on sets. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._

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