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第 5 題

2.5 分

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Which of the following about database normalization is wrong?

a.the process reduces data redundancyb.the process improve data integrityc.the 1st normal form ensures that each row in a table should be identified by primary key and no rows of data should have repeating group of column valuesd.if a table satisfies 2nd normal form, then it must satisfy 1st normal form as welle.all of the above are correct (choose this only if none of the above can be chosen).