Introduction to SQL
The command to remove rows from a table 'CUSTOMER' is:

UPDATE FROM CUSTOMER ...
DELETE FROM CUSTOMER WHERE ...
REMOVE FROM CUSTOMER ...
DROP FROM CUSTOMER ...

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Introduction to SQL
NULL is

not a value
the same as 0 for integer and blank for character
the same as blank for character
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 at least one sailor 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 all sailors who have reserved red boats but not green boats

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