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Database Systems MCQs – Practice Test 7 (Chapter 15)

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The MCQ: The result of Boolean expression 'true and unknown' is; "Database Systems Quiz" App (iOS, Android) with answers: false, true, unknown, and null to learn software engineering courses. Study View of Data Quiz Questions, download Google Book (Free Chapter) for online bachelor's degree computer science.

Introduction to SQL Quiz – Practice Test 7 PDF Download

MCQ: 31

The result of Boolean expression 'true and unknown' is

  1. True
  2. False
  3. Unknown
  4. Null
MCQ: 32

The query for finding the department names of all instructors, is

  1. select dept_name about instructor;
  2. define dept_name from instructor;
  3. select dept_name from instructor;
  4. define dept_name about instructor;
MCQ: 33

If 'A' is null for a particular tuple, then the expression result must also be null for that

  1. Expression
  2. Attribute
  3. Tuple
  4. Relation
MCQ: 34

SQL prevents any update to the database that violates an

  1. Declaration
  2. Definition
  3. Constraint
  4. Attributes
MCQ: 35

Since duplicate retention is the default, we shall not use

  1. Distinct
  2. All
  3. Describe
  4. Whole

Introduction to SQL Study Material – Database Systems App & e-Book Quizzes

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