Introduction to SQL
What is a view?

None of these
A view is a special stored procedure executed when certain event occurs.
A view is a virtual table which results of executing a pre-compiled query. A view is not part of the physical database schema, while the regular tables are.
A view is a database diagram.

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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
None of These
Find the sailor Ids of atmost one sailor 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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Introduction to SQL
Find all the cities with temperature, condition and humidity whose humidity is in the range of 63 to 79

SELECT * FROM weather WHERE humidity NOT IN (63 AND 79)
SELECT * FROM weather WHERE humidity NOT BETWEEN 63 AND 79
SELECT * FROM weather WHERE humidity IN (63 to 79)
SELECT * FROM weather WHERE humidity BETWEEN 63 AND 79

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