フリー問題

問題文

A design wants an index over a field whose value the server works out on the fly and never keeps at all. What can InnoDB place over that field?

選択肢

1. InnoDB can therefore place a hashed index over that particular arrangement.
2. InnoDB can therefore place a primary index over that particular arrangement.
3. InnoDB can therefore place a fulltext index over that particular arrangement.
4. InnoDB can therefore place a secondary index over that particular arrangement.