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Choone two Which three statements are true about dropping and unused columns in an Oracle database? A) A primary key column referenced by another colu 阅读全文
posted @ 2019-10-21 11:40
cnblogs_5359
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Choose two. Which two statements are true about a self join? A) The join key column must have an index. B) It can be a left outer join. C) It must be 阅读全文
posted @ 2019-10-21 10:25
cnblogs_5359
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