Quiz
Which of the following statements is true?
- Our cost estimate for index-based join was the same for sparse/clustered versus non clustered/dense indexes.
- For `S= sigma_{A=c}(R)`, we gave in class a query cost estimate of `T(S)=(T(R))/(V(R,A))`.
- In class we estimated $T(R \bowtie S)$ as `(T(R) cdot T(S))/(V(R,Y)+V(S,Y))`.