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Database Systems MCQs (Computer Science) From Textbook

Database Systems MCQs – Practice Test 7 (Chapter 15)

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Free Introduction to SQL Quiz App Download (Android & iOS): Query for finding the department names of all instructors, is; MCQ with answers: define dept_name from instructor;, select dept_name about instructor;, select dept_name from instructor;, and define dept_name about instructor. Learn View of Data Quiz Questions, download Google Book (Free Chapter) for DBMS digital coursework.

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

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