問題文
Two feeds are brought together on one key, and the developer has to decide which of them should be the driving side. The advice turns out to rest on a different measure depending on whether the meeting takes its input already in order, and this one does. While wiring the ports, the developer also notices that the tool lets through links between two columns whose kinds are not the same as each other. Which pairing is right?
選択肢
- Under the sorted arrangement the feed that should be made the driving side is the one with fewer keys seen twice, and the link between the two columns goes through because what they are required to have is identical types.
- Under the sorted arrangement the feed that should be made the driving side is the one with fewer keys seen twice, and the link between the two columns goes through because what they are required to have is compatible types.
- Under the sorted arrangement the feed that should be made the driving side is the one with fewer rows brought over, and the link between the two columns goes through because what they are required to have is identical types.
- Under the sorted arrangement the feed that should be made the driving side is the one with fewer rows brought over, and the link between the two columns goes through because what they are required to have is compatible types.