单选题View the following SQL statements： Transaction T1 INSERT INTO hr.regions VALUES （5，’Pole’）；COMMIT； Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5； COMMIT； Transaction T3 UPDATE hr.regions SET region_name=’North and Sou
题目
单选题
View the following SQL statements： Transaction T1 INSERT INTO hr.regions VALUES （5，’Pole’）；COMMIT； Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5； COMMIT； Transaction T3 UPDATE hr.regions SET region_name=’North and South Poles’ WHERE region_id = 5； You want to back out transaction T2. Which option would you use？（）
A
It is possible，but transaction T3 also backs out.
B
It is possible with the NOCASCADE_FORCE option.
C
It is possible with the NONCONFLICT_ONLY option.
D
It is not possible because it has conflicts with transaction T3.
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参考答案和解析
正确答案：
C
解析：
暂无解析