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The MCQ: Constraint on an attribute specifies that the null value is not allowed for that attribute, is known to be; "SQL Data Definition" App Download [Free] with answers: foreign key attribute, candidate key attribute, not null attribute, and unique key attribute for bachelor's degree in computer science. Learn Introduction to SQL Questions and Answers, Apple iBook to download free chapter to study distance learning courses.

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MCQ 2121: The constraint on an attribute specifies that the null value is not allowed for that attribute, is known to be:

  1. Candidate key attribute
  2. Foreign key attribute
  3. Unique key attribute
  4. Not Null attribute

MCQ 2122: The contrast to the relational data model, is:

  1. Semi-structured data model
  2. Object-based Data model
  3. Entity relationship model
  4. Relation View data model

MCQ 2123: Dates must be specified in the format:

  1. day-year-month
  2. year-month-day
  3. year-date-month
  4. month-year-date

MCQ 2124: An index entry appears for only some of the search-key values, in a:

  1. Clustering index
  2. Non-clustering index
  3. Sparse index
  4. Dense index

MCQ 2125: To simplify users interaction with the system, data abstraction uses:

  1. 2 levels
  2. 3 levels
  3. 4 levels
  4. 5 levels

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