[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fsr36VYo8cUngICnXhjpau8hr6S1MKl1R6KvgMV9gqkQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":15,"related":16,"source":27,"type":60},[],"2025-06-11 20:42:46",198660325,[],{"count":9,"courseId":10,"courseImg":11,"courseName":12,"workId":13,"workName":14},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)","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 ____ ____)",[17,29,39,48,57],{"answer":18,"createTime":19,"id":20,"options":21,"question":26,"source":27,"type":28},[],"2025-06-11 20:42:44",198660272,[22,23,24,25],"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":30,"createTime":31,"id":32,"options":33,"question":38,"source":27,"type":28},[],"2025-06-11 20:42:45",198660278,[34,35,36,37],"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","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)",{"answer":40,"createTime":31,"id":41,"options":42,"question":47,"source":27,"type":28},[],198660286,[43,44,45,46],"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":49,"createTime":31,"id":50,"options":51,"question":56,"source":27,"type":28},[],198660306,[52,53,54,55],"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":58,"createTime":5,"id":6,"options":59,"question":15,"source":27,"type":60},[],[],2]