[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fePQzthffO4PzlriFeA04TMATdAQeEYrL_m5cpGkp6BY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-07 12:43:15",50890681,[8,9,10,11],"DFD","ER图","程序流程图","数据结构",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},40,"60aebb69204011c5aa6392d02776ac9c","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0d27132e8e4c25614916fe2373258c2e.jpg","数据库系统原理","work_27940505","第71011章测试题-数据库设计恢复并发控制","在数据库设计中,表示用户业务流程的常用方法是( ).(山东矿业大学)",[21,32,41,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],50890679,[25,26,27,28],"数据字典和数据流图","一组ER图","数据库模式","物理数据库","在数据库设计中,需求分析阶段的结果是( ).(安徽大学)","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],50890680,[36,37,38,39],"数据库中所涉及的属性和文件的名称集合","数据库中所涉及到字母、字符及汉字的集合","数据库中所有数据的集合","数据库中所涉及的数据流、数据项和文件等描述的集合","数据库需求分析时,数据字典的含义是( )",{"answer":42,"createTime":5,"id":6,"options":43,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],50890682,[48,49,50,51],"加工逻辑","实体联系图","流程图","数据字典","结构化分析方法中,数据流图中的元素在( )中进行定义.(软件设计师)",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],50890683,[57,58,59,60],"属性冲突","命名冲突","结构冲突","语法冲突","当局部ER合并为全局ER图时可能出现冲突,不属于合并冲突的是( ).(安徽大学)",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],50890684,[66,67,68,69],"设计局部视图→抽象→修改重构消除冗余→合并取消冲突","设计局部视图→抽象→合并取消冲突→修改重构消除冗余","抽象→设计局部视图→修改重构消除冗余→合并取消冲突","抽象→设计局部视图→合并取消冲突→修改重构消除冗余","数据库概念结构设计阶段的工作步骤依次为 ( ).(数据库系统工程师)",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],50890685,[75,76,77,78],"职工和教师实体保持各自属性不变","职工实体中加入职称属性,删除教师实体","教师也是学校的职工,故直接将教师实体删除","将教师实体所有属性并入职工实体,删除教师实体","某高校信息系统设计的分E-R图中,人力部门定义的职工实体具有属性:职工号、姓名、性别和出生日期;教学部门定义的教师实体具有属性:教师号、姓名和职称.在合并 E-R 图时,( )解决这一冲突.(软件设计师)",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],50890686,[84,85,86,87],"具有相同码的关系模式可合并","并不是规范化程度越高的关系就越优","一个m:n联系转换为一个关系模式时,该关系的码为m端实体的码与n端实体的码的组合","一个1:n联系转换为一个独立的关系模式时,该关系的码为1端实体的码","关于数据库逻辑结构设计说法不正确的是( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],50890687,[93,94,95,96],"m 端实体的码","n 端实体的码","m 端实体主键与n 端实体主键的组合","重新选取其他属性","从E-R模型向关系模式转换时,一个m:n联系转换为关系模式时,该关系模式的主键是( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],50890688,[102,103,104,105],"RR属性应包括R1与R2的所有属性","RR属性应包括R1与R2的键属性","R1与R2的键属性共同构成RR的键","RR的属性应包括RR自身定义的属性","若R是实体集R1和R2间的一个多对多联系,将其转换为关系RR,以下说法不正确的是( ).(南京理工大学)"]