フリー問題

問題文

An error message names a constraint that nobody recognizes and the name looks machine generated. The table was created last year with the constraints written beside the columns. Which cause fits and what does the team lose?

選択肢

1. The constraints were created as separate objects so their names follow the naming rule of the tool that created them rather than of the table.
2. The constraints were declared with names so the server replaced them with generated ones and the original names live on in the dictionary alone.
3. The constraints were rebuilt when the table was reorganized so their names were regenerated and the earlier names were dropped.
4. The constraints were declared without names so the server made one for each of them and the messages now carry names that say nothing about the rule.