By Raghu Ramakrishnan,Johannes Gehrke,Jeff Derstadt, Scott Selikoff, and Lin Zhu
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This is because all the aggregate operators, except for COUNT, ignore NULL values. So the ﬁrst approach would compute the average over all tuples while the second approach would compute the average over all tuples with non-NULL rating values. However, if the aggregation is done on the age ﬁeld, the answers using both approaches would be the same since the age ﬁeld does not take NULL values. 3. Only the ﬁrst query is correct. The second query returns the names of sailors with a higher rating than at least one sailor with age < 21.
D) Only faculty in the department with deptid=33 teach more than three courses. (e) Every student must be enrolled in the course called Math101. , the class with the smallest meets at value) meets should not be the same as the room in which the latest scheduled class meets. (g) Two classes cannot meet in the same room at the same time. (h) The department with the most faculty members must have fewer than twice the number of faculty members in the department with the fewest faculty members. (i) No department can have more than 10 faculty members.
5 The answers are shown below: 1. rating) FROM Sailors S 2. The result using SUM and COUNT would be smaller than the result using AVERAGE if there are tuples with rating = NULL. This is because all the aggregate operators, except for COUNT, ignore NULL values. So the ﬁrst approach would compute the average over all tuples while the second approach would compute the average over all tuples with non-NULL rating values. However, if the aggregation is done on the age ﬁeld, the answers using both approaches would be the same since the age ﬁeld does not take NULL values.