[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fnTy5kbGVp-InwriKC6OwnxCjqWTFfy-IpH2404ieSEI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2025-06-11 20:42:45",198660278,[8,9,10,11],"mysql -u root -p security_system > \u002Ftmp\u002Fsecurity_system.sql","mysqldump -u root -p security_system > \u002Ftmp\u002Fsecurity_system_backup.sql","mysqldump -u root security_system -p > \u002Ftmp\u002Fsecurity_system.sql","mysqldump -u root -p security_system > \u002Ftmp\u002Fsecurity_system.sql",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},5,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_42398985","项目二-MYSQL基础2-备份与还原-课中练习(7-1)","以下哪个命令是用于使用mysqldump工具以用户名root备份名为security( )system.sql文件的? (D)",[21,33,36,45,54],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-06-11 20:42:44",198660272,[26,27,28,29],"SELECT * FROM user_info","SELECT ALL FROM user_info","SELECT EVERYTHING FROM user_info","SELECT ALL COLUMNS FROM user_info","以下哪个SQL语句用于从user_info表中选择所有列的所有记录?( )","v1",0,{"answer":34,"createTime":5,"id":6,"options":35,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":37,"createTime":5,"id":38,"options":39,"question":44,"source":31,"type":32},[],198660286,[40,41,42,43],"DELETE DATABASE security_system","DROP DATABASE security","ERASE DATABASE security_system","DROP DATABASE security_system","以下哪个SQL命令用于删除名为security_system的数据库?( )",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":31,"type":32},[],198660306,[49,50,51,52],"mysql -u root -p security_system < \u002Ftmp\u002Fsecurity_system.txt","mysql -u root -p \u002Ftmp\u002Fsecurity_system.sql","mysql -u root security_system < \u002Ftmp\u002Fsecurity_system.sql","mysql -u root -p security_system < \u002Ftmp\u002Fsecurity_system.sql","以下哪个命令用于将\u002Ftmp\u002Fsecurity_system.sql文件中的数据导入到名为security_system的MySQL数据库中,且以root用户身份执行?( )",{"answer":55,"createTime":56,"id":57,"options":58,"question":59,"source":31,"type":60},[],"2025-06-11 20:42:46",198660325,[],"MySQL中,请根据以下条件创建一个user_info表,该使用哪个命令?字段:id,类型:int,约束条件:主键字段:username,类型:char(8),约束条件:不能为空字段:usertel,类型:char(20),约束条件:不能为空注意:括号请使用英文字符的括号,不要使用中文字符括号create table user_info(id ____ ____, username ____ ____, usertel ____ ____)",2]