[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGpKjOhnnCmzO0nwMqWnrYSvz6xTKx479FRvoNbIRwsQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-06-06 16:35:14",115679388,[8,9,10,11],"实体、属性、联系","实体、实体集、联系","实体、属性、属性值","实体、实体集、属性",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},85,"4e50e5163aa7de56a12b1df02c664512","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9dce7eb0f051dba47069fbd230e13acd.jpg","Access数据库应用（Access2016）","35e2793097124a0281f72be1aff2338b","","构造E-R模型的3 个基本要素是( )",[21,33,41,47,56,64,73,82,85,94],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2023-12-18 22:31:00",115679377,[26,27,28,29],"外模式","内模式","存储模式","模式(概念模式)","在数据库的三级模式结构中,描述数据库中全体数据的全局逻辑结构和特性的是( )","v1",0,{"answer":34,"createTime":35,"id":36,"options":37,"question":40,"source":31,"type":32},[],"2023-12-18 22:31:01",115679379,[26,38,27,39],"概念模式","逻辑模式","在数据库三级模式中,用逻辑数据模型对用户所用到的那部分数据的描述是()",{"answer":42,"createTime":35,"id":43,"options":44,"question":46,"source":31,"type":32},[],115679381,[45,26,28,27],"模式","在关系数据库中,表是三级模式结构中的( )",{"answer":48,"createTime":35,"id":49,"options":50,"question":55,"source":31,"type":32},[],115679383,[51,52,53,54],"外模式\u002F内模式","外模式\u002F模式","外模式\u002F外模式","模式\u002F模式","数据库的三级模式之间存在的映象关系正确的是( )",{"answer":57,"createTime":35,"id":58,"options":59,"question":63,"source":31,"type":32},[],115679384,[60,28,61,62],"数据结构规范化","数据独立性","最小冗余","数据库三级模式体系结构主要的目标是确保数据库的( )",{"answer":65,"createTime":35,"id":66,"options":67,"question":72,"source":31,"type":32},[],115679385,[68,69,70,71],"数据的物理独立性","数据的逻辑独立性","数据的位置独立性","数据的存储独立性","在关系数据库系统中,当关系的模型改变时,用户程序也可以不变,这是()",{"answer":74,"createTime":35,"id":75,"options":76,"question":81,"source":31,"type":32},[],115679387,[77,78,79,80],"层次模型","网状模型","关系模型","E-R模型","下列给出的数据模型中,属于概念数据模型的是( )",{"answer":83,"createTime":5,"id":6,"options":84,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":86,"createTime":35,"id":87,"options":88,"question":93,"source":31,"type":32},[],115679389,[89,90,91,92],"实体间的联系不能有属性","仅在两个实体之间有联系","单个实体不能构成E-R图","实体间可以存在多种联系","下列关于数据模型中实体间联系的描述正确的是( )",{"answer":95,"createTime":5,"id":96,"options":97,"question":102,"source":31,"type":32},[],115679391,[98,99,100,101],"商品条形码与商品之间的联系","学生与课程之间的联系","车间与工人之间的联系","飞机的座位与乘客之间的联系","下列实体类型的联系中,属于 "多对多"联系的是()"]