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

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Introduction to SQL
Which of the following query is correct for using comparison operators in SQL?

SELECT name, course_name FROM student WHERE age>50 and <80;
None of these
SELECT name, course_name FROM student WHERE age>50 and age <80;
SELECT name, course_name FROM student WHERE age>50 and WHERE age<80;

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