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[最佳答案] subquery in from must have an alias解决方法如下:subquery in from must have an alias。从中选择一个别名。any select list item that is not a simple column reference must have an alias.任何不是简单列引用的选择列表项都必须有别名。you must have an audio device in order to encode from device.要从设备编码,必须有一个音频设备。you must have an audio device in order to encode.您必须具有音频设备以进行编码。 学英语技巧: 1、确立主语:(1)避免主语机械对应:这个地区雨比较多。It rains a lot in this area.(2)方位词或时间词在主语位置:山下住着一位老妇人。There lives an old lady at the foot of the mountain.(3)用it做主语翻译主语是复合结构的汉语:例1:信不信是