フリー問題

問題文

A filter must be applied before a large join so that the join processes far fewer rows. Which mechanism can express that, and why?

選択肢

1. A field filter, because field filters are rewritten into the innermost subquery of the dataset by the dashboard.
2. A calculated field, because calculated fields are evaluated during the dataset query and can gate the join.
3. A parameter, because its value is substituted into the dataset query and can therefore be placed anywhere in it, including before a join.
4. Neither, because the placement of filters inside a dataset query cannot be influenced from the dashboard at all.