問題文
A dataset holds one row per race with a column for the points awarded to each driver. The rules say the points for a race can never exceed 102 and must be above 50.5, and that no two rows may be identical. Which pair of constraints does that call for?
選択肢
- Write a sum constraint across the rows and a duplicate constraint across the rows, since a lone value check cannot see the whole table.
- Write a range constraint across the fields and a typing constraint across the fields, since a lone value check cannot see the entire table.
- Write a correlate constraint across the records and a greater constraint across the records, since a lone value check cannot see the whole listing.
- Write a count constraint across the entries and a useful constraint across the entries, since a lone value check cannot see the broad listings.