FIELDS (ATTRIBUTES, COLUMNS) Field names sid пате login age gpa 50000 Dave dave@cs 19 3.3 53666 Jones jones@cs 18 3.4 TUPLES 53688 Smith smith@ee 18 3.2 (RECORDS, ROWS) 53650 Smith smith@math 19 3.8 53831 Madayan madayan@music 53832 Guldu 11 1.8 guldu@music 12 2.0 Figure 3.1 An Instance S1 of the Students Relation Exercise 3.5 Consider the instance of the Students relation shown in Figure 3.1. 1. Give an example of an attribute (or set of attributes) that you can deduce is not a candidate key, based on this instance being legal. 2. Is there any example of an attribute (or set of attributes) that you can deduce is a candidate key, based on this instance being legal?

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