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I have the same issue. When i’m importing magento_sample_data_for_0.8.16100.sql i have several duplicate key errors.
I think the problem is from “INSERT” queries. Some insert queries try to put “0” as data in an auto_increment field.
So, in the database, the value inserted is “1” (not 0) and the next insert query with the value “1” can’t be inserted because these datas exist.
I don’t know if i’m clear, i don’t speak well in english.