8.7

Compute the relevance (using appropriate definitions of term frequency and inverse document frequency) of each of the Practice Exercises in this chapter by the query “SQL relation”.

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We do not consider the questions containing neither of the keywords because their relevance to the keywords is zero. The number of words in a question include stop words. We use the equations given in Section 31.2 to compute relevance; the \(\log\) term in the equation is assumed to be to the base \(2\).