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Database Systems MCQs – Practice Test 25 (Chapter 15)

Introduction to SQL MCQs with Answers PDF Download – Test 25

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Free Introduction to SQL Learning App Download: Pattern generated by the example "_ _ _" would be matching string of; MCQ with answers: starting with three characters, ending with three characters, exactly three characters, and at least three characters. Solve Join Expressions Quiz Questions, download Google e-Book (Free Chapter) to develop online databases.

Introduction to SQL MCQs – Practice Test 25 PDF Download

MCQ 121: In queries that contain subqueries, a scoping rule is applied for:

  1. Variable names
  2. Function names
  3. Correlation names
  4. Subquery name

MCQ 122: The pattern generated by the example "_ _ _" would be matching string of:

  1. Ending with three characters
  2. Starting with three characters
  3. Exactly three characters
  4. At least three characters

MCQ 123: A Boolean data type is the one that can take values:

  1. True/False
  2. Unknown
  3. Both A and B
  4. 0 and 1

MCQ 124: The primary-key specifications are:

  1. Mandatory
  2. Optional
  3. Unique
  4. Identity node

MCQ 125: SQL allows subqueries wherever an expression returning a value is permitted, provided the subquery returns:

  1. Single attribute
  2. One tuple
  3. Single value
  4. Both A and B

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