4. (15 points) Consider a situation in which reports are often generated for each value of a column with only a “few” possible values, (such as a “M F” gender column or a “State” column (a) Are these columns usually good candidates for indexes? Why or why not? gender column or a State column (b) What if the tuples in these tables could be stored on disk in order (lexically, numerically, whatever is appropriate) would queries benefit from this? Why or why not?
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