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sql 删除重复行(ALL或DISTINCT)
- WBOYOriginal
- 2016-06-07 17:50:012096browse
删除重复行SELECT语句中使用ALL或DISTINCT选项来显示表中符合条件的所有行或删除其中重复的数据行，默认为ALL。使用DISTINCT选项时，对于所有重复的数据行在SELECT返回的结果集合中只保留一行
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