Introduction to SQL
Which of the SQL statements is correct?

SELECT Username, Password FROM Users
SELECT Username, Password WHERE Username = 'user1'
None of these
SELECT Username AND Password FROM Users

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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 at least one sailor who have reserved red boats but not green boats
Find the sailor IDs of all sailors 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
NULL is

the same as 0 for integer
not a value
the same as 0 for integer and blank for character
the same as blank for character

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