听力原文:W: Could you please tell me where I can find Robinson Crusoe by Daniel Defoe? M: Sure. It should be over there with all the novels. They are arranged alphabetically by group. Q: Where is the conversation probably taking place? (17)
【单选题】有一个事务在session a被执行, begin; update tab_a set x = 1 where y = 3 ; update tab_a set x = 2 where y = 2 ; update tab_a set x = 3 where y = 3 ; commit; 下面关于这个事务的描述正确的是: