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042-167

原创 Linux操作系统 作者:jbymy2000 时间:2012-03-15 19:49:27 0 删除 编辑
167: Which three statements correctly describe the functions and use of constraints? (Choose three.) A. Constraints provide data independence. B. Constraints make complex queries easy. C. Constraints enforce rules at the view level. D. Constraints enforce rules at the table level. E. Constraints prevent the deletion of a table if there are dependencies. F. Constraints prevent the deletion of an index if there are dependencies.
答案:C D E

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