With each visit of this Database Management System online Quiz / Practice Test, the list of MCQs / Objective Questions presented will be different, offering you a diverse set of practice opportunities. This variability encourages you to practice extensively, refining the accuracy of your answers and your overall grasp of the content. By utilizing this resource, you can hone your skills and become more adept at managing time constraints during actual exams.
Test Instructions Question type Randomized MCQs.Changes every time you visit the test Total Number of Questions 30 Time Limit 20 Minutes Points 1 Point for each Question
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Question 1 of 30
Q-1.The foreign key is equal to the candidate key in some row of the primary table, or else has no value (the NULL value.). This rule is called a ______ between the two tables.
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Question 2 of 30
Q-2.The _______ should be chosen such that its attributes are never, or very rarely changed.
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Question 3 of 30
Q-3.It is convenient at times to write a relational algebra expression by assigning parts of it to temporary relation variables. Which of the following operation will be used for that?
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Question 4 of 30
Q-4.SQL is based on______
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Question 5 of 30
Q-5.Which of the following operation behave just like join operations except on tuples that do not occur in the join results?
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Question 6 of 30
Q-6.The Project operation selects tuples with some attributes that we wish to include but some attribute we do not want to include in the final relation. We use the lowercase______ to denote Project operation.
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Question 7 of 30
Q-7.A_______is a set of one or more attributes that, taken collectively; allow us to identify uniquely an entity in the entity set.
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Question 8 of 30
Q-8.For a Binary relationship set R between entity sets A and B,the ________ express the number of entities to which another entity can be associated.
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Question 9 of 30
Q-9.Which of the following describe the snapshot of the data in the database at a given instant in time?
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Question 10 of 30
Q-10.A___ in a table represents a relationship among a set of values.
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Question 11 of 30
Q-11.Diamond Represents______
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Question 12 of 30
Q-12.Natural join operation is denoted by symbol____
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Question 13 of 30
Q-13.For example, the customer entity set has an attribute loan-taken, which represents how many loans a customer has from the bank, the attribute loan-taken is______
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Question 14 of 30
Q-14.The tuple relational calculus is a ___________Query Language.
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Question 15 of 30
Q-15.The Domain relational calculus is a ___________Query Language.
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Question 16 of 30
Q-16.Which of the following describes the relation name (table name), attributes, and their names?
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Question 17 of 30
Q-17.Which of the following diagram link attributes to entity sets and entity sets to relationship sets?
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Question 18 of 30
Q-18.Dashed ellipses represents_____
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Question 19 of 30
Q-19.Suppose we want to list all loan numbers and the amount of the loans, but do not care about the branch name. Which of the following operation allows us to produce this relation?
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Question 20 of 30
Q-20.Which of the following operation that allows us to combine certain selections and a Cartesian product into one operation?
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Question 21 of 30
Q-21.______ is the restrictions imposed to maintain the data integrity of the database
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Question 22 of 30
Q-22.Consider the entity relationship which consists of two entity sets, customer and loan, related through a binary relationship set borrower. An undirected line (--) from the relationship set borrower to the entity set loan specifies that borrower is either a __________ or __________relationship set from customer to loan.
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Question 23 of 30
Q-23.Datalog is based on______
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Question 24 of 30
Q-24.Double Rectangle represent_____
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Question 25 of 30
Q-25.For a Binary relationship set R between entity sets A and B, the ________ express the number of entities to which another entity can be associated.
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Question 26 of 30
Q-26.Double Line indicate_____
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Question 27 of 30
Q-27.For a binary relationship set R between entity sets A and B, the Mapping Cardinality is ONE TO ONE if
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Question 28 of 30
Q-28.Which of the following Statements stands true for Full outer-join?
The left outer join takes all tuples in the left relation that did not match with any tuple in the right relation, pads the tuples with null values for all other attributes from the right relation, and add them to the result of the natural join. It pads tuples from the right relation that did not match any from the left relation with nulls and adds them to the result of the natural join. it pads tuples from the left relation that did not match any from the right relation, as well as tuples from the right relation that did not match any from the left relation, and adding them to the result of join It takes all tuples in the right relation that did not match with any tuple in the right relation, pads the tuples with null values for all other attributes from the right relation, and add them to the result of the natural join.
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Question 29 of 30
Q-29.Which of the following take a collection of values and return a single value as a result?
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Question 30 of 30
Q-30.For a weak entity set to be meaningful, it must be associated with another entity set called the ___________
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