[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fe9-RwthfbduclNBCjIw8TSmbMt0ZJopC4c4nu0E2N1c":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2023-11-09 13:29:16",104634191,[8,9,10,11],"子查询不应该用圆括号括起","子查询中OrderID应该用*代替","上面所有都不正确","'='应该改成'IN'",{"courseId":13,"courseImg":14,"courseName":15},"0dcefeeb453e7a3aa6a0f00cc042f1d6","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbb062ff6068e05b64e1dc4486da29b2a.jpg","网络数据库技术","下面这个语句有什么问题?SELECT* FROM Orders WHEREOrderID = (SELECT OrderID FROM OrderItems WHERE ItemQty> 50)",[18,29,32,42,51,60,69,78,87,96],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],104634189,[22,23,24,25],"distinct的作用是分组","distinct可以和函数结合使用,如count(distinct col)","sql语句里使用了distinct,就不能使用group by或者order by","distinct的查询结果一定是从小到大排序的","以下关于distinct的描述,正确的是( )","v1",0,{"answer":30,"createTime":5,"id":6,"options":31,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":33,"createTime":34,"id":35,"options":36,"question":41,"source":27,"type":28},[],"2023-11-09 13:29:17",104634194,[37,37,38,38,39,39,40],"ORDER BY","HAVING","GROUP BY","SUM","一个班级有n个学生,每个学生有m门课程的成绩,假设成绩表结构为(学生id,课程,成绩),要查询出总成绩最高的前k名学生,不需要用到的SQL关键字有( )",{"answer":43,"createTime":34,"id":44,"options":45,"question":50,"source":27,"type":28},[],104634195,[46,47,48,49],"有备份以及备份以来的所有binlog","有最近一天的全备份以及最近两天的binlog","有每天凌晨的完整备份以及每天中午的增量备份","无备份,但有所有的binlog","数据误删除后,下面哪种情况下无法将数据完整恢复出来( )",{"answer":52,"createTime":34,"id":53,"options":54,"question":59,"source":27,"type":28},[],104634196,[55,56,57,58],"可用INSERT或LOAD DATA语句插入行,每插入一行数据时都会触发insert触发器","触发器对语句引起的表、视图的变化都会触发触发器","触发器关联到一个表,当这个表发生某种特殊事件时被触发","当一条SQL语句对一个表进行插入、更新或删除数据行操作时,可触发表中对应的触发器","关于触发器描述错误的是( )",{"answer":61,"createTime":34,"id":62,"options":63,"question":68,"source":27,"type":28},[],104634197,[64,65,66,67],"STATIC","INOUT","IN","OUT","存储过程的参数类型不包括( )",{"answer":70,"createTime":34,"id":71,"options":72,"question":77,"source":27,"type":28},[],104634198,[73,74,75,76],"输入输出变量","可读变量","输入变量","输出变量","存储过程中OUT变量的含义是( )",{"answer":79,"createTime":34,"id":80,"options":81,"question":86,"source":27,"type":28},[],104634199,[82,83,84,85],"SHOW PROCEDURE STATUS","CREATE PROCEDURE","CALL 存储过程名字","SHOW CREATE PROCEDURE 存储过程名字","要查看某个存储过程的具体内容的MySQL语句是( )",{"answer":88,"createTime":34,"id":89,"options":90,"question":95,"source":27,"type":28},[],104634200,[91,92,93,94],"mysqld -u user -p","mysql -u user -p","mysqldump -u user -p","mysqladmin -u user -p","MySQL命令行客户端连接本机MySQL服务器的命令是( )",{"answer":97,"createTime":34,"id":98,"options":99,"question":104,"source":27,"type":28},[],104634202,[100,101,102,103],"net start","mysqld --initialize","net stop","mysqld --install","安装mysql服务器时,安装服务的命令是( )"]