DBMS-Relational Algebra and Calculus

DBMS-Relational Algebra and Calculus
41. Which of the following aspects of data is the concern of a relational database model ?
  • data manipulation
  • data integrity
  • data structure
  • all of these
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42. What is the smallest unit of data in the relational model ?
  • data type
  • field
  • data value
  • none of these
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43. Dr. Edgar F. Codd proposed a set of rules that were intended to define the important characterstic and capabilities of any relational system.
  • TRUE
  • FALSE
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44. Codd's Logical Dta independence rule states that user operations and application programs should be independent of any changes in the logical structure of base tables provided they involve no loss information
  • TRUE
  • FALSE
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45. The entire field of RDBMS has its origin in Dr. E.F. Codd's paper.
  • TRUE
  • FALSE
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46. ISBL has no aggregate operators for example, agverage, mean and so on.
  • TRUE
  • FALSE
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47. ISBL has no facilities for insertion, deletion or modification of tuples.
  • TRUE
  • FALSE
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48. QUEL is a tuple relational calculus language of a relational database system INGRESS (Interactive Graphics and Retrieval system).
  • TRUE
  • FALSE
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49. QUEL supports relational algebraic operations such as intersection, minus or union.
  • TRUE
  • FALSE
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50. The first commercial REBMS was IBM'S DB2
  • TRUE
  • FALSE
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