Introduction to SQL
A subquery in an SQL SELECT statement:

can always be duplicated by a join.
cannot have its results sorted using ORDER BY.
can only be used with two tables.
has a distinct form that cannot be duplicated by a join.

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Introduction to SQL
What does the following query find?(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'red')MINUS(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'green')

Find the sailor IDs of all sailors who have reserved red boats but not green boats
Find the sailor IDs of at least one sailor who have reserved red boats but not green boats
None of These
Find the sailor Ids of atmost one sailor who have reserved red boats but not green boats

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