《不来梅的音乐家》中那头驴子老了,主人打算杀掉它,为了活命,驴子决定逃到不远的不来梅市去,在路上驴子遇到了和它有相同遭遇的狗、猫和公鸡。()
查看答案
Note the following statements that use flashback technology: 1. FLASHBACK TABLE TO SCN ; 2. SELECT * FROM AS OF SCN 123456; 3. FLASHBACK TABLE TO BEFORE DROP; 4. FLASHBACK DATABASE TO TIMESTAMP ; 5. SELECT * FROM VERSIONS AS OF SCN 123456 AND 123999; Which of these statements will be dependent on the availability of relevant undo data in the undo segment?()
A. 1, 2, and 5
B. 1, 3, and 4
C. 2, 3, 4, and 5
D. 1, 2, 3, 4, and 5
社会的急剧变迁往往会造成角色中断。
A. 正确
B. 错误