简述满足1NF关系可能存在的问题。
(1)数据冗余(2分):(2)插入异常(1分)(3)修改异常(1分)(4)删除异常(1分)
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重新组合段落:Rearrange the following sentences so that they read logically. Put the corresponding letters in a proper sequence in the boxes provided on the answer sheet. The positions of some sentences have been given.A. In order to avoid th