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Consider the following four relational schemas. For each schema, all non-trivial functional dependencies are listed. The underlined attributes are the respective primary keys. Schema I: Field ‘courses’ is a set-valued attribute containing the set of courses a student has registered for. Non-trivial functional dependency: rollno → courses Schema II: Non-trivial functional dependencies: rollno, courseid → email email → rollno Schema III: Non-trivial functional dependencies: rollno, courseid → marks, grade marks → grade Schema IV: Non-trivial functional dependencies: rollno, courseid → credit courseid → credit Which one of the relational schemas above is in 3NF but not in BCNF?
Which of the following statements are true about dependency theory? (A) Dependency theory was strongly influenced by Marxists and Non-Leninists who were critical of Development theory (B) Dependency theory stressed the peaceful, evolutionary process of modernisation (C) Development in the third world was dependent on development in the already developed nations. (D) The First World does not exploit the third world Choose the most appropriate answer from the options given below:
Which of the following statements are correct with regard to the 'truth and validity' in logical reasoning. Select the correct code from the below: (a) Truth and falsity are attributes of individual propositions. (b) Validity and invalidity are attributes of individual propositions. (c) Truth and falsity are attributes of arguments. (d) Validity and invalidity are attributes of arguments. Code:
Consider the following statements regarding database normal forms: 1. Any relation with two attributes is BCNF. 2. Lossless, dependency - preserving decomposition into BCNF is always possible. 3. Lossless, dependency - preserving decomposition into 3NF is always possible. 4. BCNF is stricter than 3NF. Which of the above statements are correct?
If a multivalued dependency holds and is not implied by the corresponding functional dependency, it usually arises from one of the following sources.
A functional dependency is a relationship between or among:
If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then
A functional dependency f on R is _______ by a set of functional dependencies F on r if every instance of r(R) that satisfies f also satisfies F.
Assertion (A): When there is an evidence of a linear relationship between two variables, it may not always mean an independent-dependent relationship between the two variables.
Reason (R): The casual relationship between the two variables may not imply a reasonable theoretical relationship between the two.
Read the following sentences and choose the correct option. (i) Variables can only take discrete values while Attributes can take continuous values. (ii) Variables can only take continuous values while Attributes take discrete value. (iii) Attributes and variables are dependent on each other. (iv) Width of an impeller blade is a variable but no. of defective blades in a lot is an attribute.