【单选题】【消耗次数：1】
DB的三级结构模式结构中最接近用户的是___。
①
.内模式
②
外模式
③
概念模式
④
用户模式
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【简答题】
数据库系统的三级模式结构是指数据库系统是由[填空1]、内模式和外模式 三级构成。
【简答题】
数据库体系结构按照模式、[填空]和内模式三级结构进行组织。
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