皮皮学，免费搜题
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【多选题】
关系模型为什么要有完整性规则（ ）
A.
保证数据库中的数据正确有效
B.
数据库管理员随意制定的一些规则
C.
为了让数据库中的数据更加真实的体现现实世界
D.
为了保证数据库中数据的安全性
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