Test2 Rishi - a) One relation is created. b) Two relations...

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SUBJECT: DBS TIME : 10 min. MARKS : 10 TEST-2 OBJECTIVE TYPE QUESTIONS TEST 1. A primary key is which of the following? a. Any attribute b. An attribute that uniquely identifies each row     c. An attribute that uniquely identifies each column d. A derived attribute 2. A foreign key is which of the following? a) Any attribute b) The same thing as a primary key c) An attribute that serves as the primary key of another relation     d) An attribute that serves no purpose 3. Relations are: a) two-dimensional tables     b) three-dimensional tables c) four-dimensional tables d) five-dimensional tables 4. A relation has which of the following properties? a) Each row is not unique. b) Attributes can have the same name within a given table. c) Each relation has a unique name.     d) The order of the columns is significant. e) 5. When mapping a regular entity into a relation which of the following is true?
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Unformatted text preview: a) One relation is created. b) Two relations are created c) Three relations are created. d) Four relations are created 6. When mapping a ternary relationship with an associative entity into a relation which of the following is true? a) One relation is created. b) Two relations are created c) Three relations are created d) Four relations are created 7. A candidate key must uniquely identify each row. a) True b) False 8. Weak entities do not get mapped into a relation. a)True b) False 9. A primary key may be null. a) True b) False 10 . A set of one or more attributes is? a) Primary key. b) Candidate key c) Super key d) Foreign key...
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Test2 Rishi - a) One relation is created. b) Two relations...

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