Introduction to SQL
Which of the following SQL query is correct for selecting the name of staffs from 'staffinfo' table where salary is 10,000 or 25,000?

SELECT name FROM staffinfo WHERE salary BETWEEN 10000 AND 25000;
SELECT name FROM staffinfo WHERE salary IN (10000, 25000);
None of these
Both A and B

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Introduction to SQL
NULL is

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

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

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