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.Consider an employee entity set with the attribute phone-number, attribute phone-number is a ________
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Question 2 of 30
Q-2.Which of the following operation, denoted by cross (×), allows to combine the information from any two relation.
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Question 3 of 30
Q-3.An expression {<X1,X2,….Xn > | P(X1,X2,….Xn)} , Where X1,X2,….Xn represent Domain variable. P represents a formula composed of atoms. This expression is of the of the following?
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Question 4 of 30
Q-4.Which one of the following allows us to uniquely identify the entity in the entity set?
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Question 5 of 30
Q-5.The number of Entity sets that participate in a relationship set is know as ____________ of Relationship
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Question 6 of 30
Q-6.Which of the following structure represent the entity sets?
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Question 7 of 30
Q-7.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 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.An entity set may not have sufficient attributes to form a primary key; such an entity set is termed as______
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Question 10 of 30
Q-10.The tuple relational calculus is a ___________Query Language.
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Question 11 of 30
Q-11.The Binary operation Union, denoted, as in the set theory by _____
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Question 12 of 30
Q-12.Datalog is based on______
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Question 13 of 30
Q-13.__________is a set of entities of same type that share the same properties or attributes.
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Question 14 of 30
Q-14.In a Entity sets Customer and Loan, an Attribute name consisting of first-name ,middle-name, and last-name. An Attribute name is _______
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Question 15 of 30
Q-15.SQL is based on______
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Question 16 of 30
Q-16.The _______ should be chosen such that its attributes are never, or very rarely changed.
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Question 17 of 30
Q-17.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 18 of 30
Q-18.An ER diagram can express the overall __________of a database graphically
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Question 19 of 30
Q-19.An Edge between a entity set and a binary relationship set can have an associated minimum and maximum cardinality, shown in the form of l and h, where l is the minimum and h is the maximum cardinality. What a Maximum Cardinality value of 1 indicates?
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Question 20 of 30
Q-20.Which of the following take a collection of values and return a single value as a result?
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Question 21 of 30
Q-21.Which of the following Statements stands true for Left 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,abd 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 22 of 30
Q-22.An Attribute takes a ________value when an entity does not have a value for it.
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Question 23 of 30
Q-23.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 24 of 30
Q-24.The purpose of the foreign key is to identify a particular row of ___________.
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Question 25 of 30
Q-25.__________ is the snapshot of the relation at a particular time. It consists of the data which is present inside the relation at a particular instance of time. Duplicate row entries are not allowed in the _____. Though in SQL, duplicate rows are allowed in the table.
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Question 26 of 30
Q-26.Which of the following symbol can be used for Assignment operation in the relational algebra expression?
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Question 27 of 30
Q-27.The mathematical terms relation tuples
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Question 28 of 30
Q-28.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 29 of 30
Q-29.Which of the following describes the relation name (table name), attributes, and their names?
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Question 30 of 30
Q-30.The select, project and rename operations are called____
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