Introduction to SQL
The benefits of a standard relational language include which of the following?

Applications are not needed
All of these
Reduced training costs
Increased dependence on a single vendor

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Introduction to SQL
Which of the following query finds the names of the sailors who have reserved at least one boat?

SELECT DISTINCT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;
None of These
SELECT DISTINCT s.sname FROM sailors, reserves WHERE s.sid = r.sid;
SELECT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

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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 atmost one sailor who have reserved red boats but not green boats
None of These
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

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