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Database Systems MCQs – Mock Test 50

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Generalization MCQs – Mock Test 50 PDF Download

MCQ: 246

In generalization, the constraint in which membership is evaluated on the basis of an explicit predicate, is known as

  1. User-defined
  2. System-defined
  3. Condition-defined
  4. Data-defined
MCQ: 247

The indexing technique should be evaluated on the basis of factors of type

  1. 3 types
  2. 4 types
  3. 5 types
  4. 6 types
MCQ: 248

The number of error(s) in the following query is/are:
select avg (salary)
from instructor;
where dept name=Comp. Sci.

  1. 1
  2. 2
  3. 3
  4. 4
MCQ: 249

SQL also does not support actions

  1. Input from users
  2. Output to display
  3. Communication over network
  4. All of the Above
MCQ: 250

The update statements should be executed as a

  1. No transaction
  2. Single transaction
  3. Two transaction only
  4. Multiple transactions

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