优点：
SQL批处理的即时结果的特性，直接可以看出插入、修改、删除了哪些数据，而不用中间语言（C#\Java\Python\Ruby）去比较信息，对用户调试，特别是对于几 千上万用户信息的情况尤其有利。
缺点：
下面标红的地方。
在这里其实，所有工作都已经完成了，如果有兴趣，可以往下看。
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