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Ssname Sailors S Ssid NOT IN ( SELECT Rsid FROM Reserves R WHERE Rbid IN ( SELECT Bbid FROM Boats B WHERE Bcolor = red )
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This query computes the names of sailors whose sid is not in the set 22, 31, and 64 In contrast to Query Q21, we can modify the previous query (the nested version of Q2) by replacing the inner occurrence (rather than the outer occurence) of IN with NOT IN This modi ed query would compute the names of sailors who have reserved a boat that is not red, ie, if they have a reservation, it is not for a red boat Let us consider how In the inner query, we check that Rbid is not either 102 or 104 (the bids of red boats) The outer query then nds the sids in Reserves tuples where the bid is not 102 or 104 On instances B1, R2, and S3, the outer query computes the set of sids 22, 31, 64, and 74 Finally, we nd the names of sailors whose sid is in this set We can also modify the nested query Q2 by replacing both occurrences of IN with NOT IN This variant nds the names of sailors who have not reserved a boat that is not red, ie, who have only reserved red boats (if they ve reserved any boats at all) Proceeding as in the previous paragraph, on instances B1, R2, and S3, the outer query computes the set of sids (in Sailors) other than 22, 31, 64, and 74 This is the set 29, 32, 58, 71, 85, and 95 We then nd the names of sailors whose sid is in this set
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542 Correlated Nested Queries
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In the nested queries that we have seen thus far, the inner subquery has been completely independent of the outer query In general the inner subquery could depend on the row that is currently being examined in the outer query (in terms of our conceptual evaluation strategy) Let us rewrite the following query once more: (Q1) Find the names of sailors who have reserved boat number 103 SELECT Ssname FROM Sailors S WHERE EXISTS ( SELECT * FROM Reserves R WHERE Rbid = 103 AND Rsid = Ssid ) The EXISTS operator is another set comparison operator, such as IN It allows us to test whether a set is nonempty Thus, for each Sailor row S, we test whether the set
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of Reserves rows R such that Rbid = 103 AND Ssid = Rsid is nonempty If so, sailor S has reserved boat 103, and we retrieve the name The subquery clearly depends on the current row S and must be re-evaluated for each row in Sailors The occurrence of S in the subquery (in the form of the literal Ssid) is called a correlation, and such queries are called correlated queries This query also illustrates the use of the special symbol * in situations where all we want to do is to check that a qualifying row exists, and don t really want to retrieve any columns from the row This is one of the two uses of * in the SELECT clause that is good programming style; the other is as an argument of the COUNT aggregate operation, which we will describe shortly As a further example, by using NOT EXISTS instead of EXISTS, we can compute the names of sailors who have not reserved a red boat Closely related to EXISTS is the UNIQUE predicate When we apply UNIQUE to a subquery, it returns true if no row appears twice in the answer to the subquery, that is, there are no duplicates; in particular, it returns true if the answer is empty (And there is also a NOT UNIQUE version)
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