[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fZ3wXcfF3SCaHKnfK62k6odXWun0Kz5-ytBjux75bu0k":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":30,"type":31},[],"2024-01-09 22:19:55",129835030,[8,9,10],"可以在创建表时如下定义性别列:性别 nchar(1) check(性别 between '男' and '女')","可以在创建表时如下定义性别列:性别 nchar(1) check(性别='男' or 性别='女')","不能在修改表的时候给它增加检查约束",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},41,"1377864de1675a7ce4abb837b4d86a5d","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c1e48361b00f3ee2086f4e259ed792b.jpg","数据库原理及应用","exam_113254540","2022级安防、网安专业学学期练习卷","对生学生表的性别列,需要使用约束使用得它只能取男或女,则下列说法正确的是",[20,32,41,50,58,67,75,84,93,102],{"answer":21,"createTime":22,"id":23,"options":24,"question":29,"source":30,"type":31},[],"2024-01-09 22:19:54",129835010,[25,26,27,28],"SIZE用于指定表空间数据文件的是否自动扩展","NEXT用于指定表空间数据文件的是否自动扩展","可以在创建表空间时定义多个数据文件","AUTOEXTEND ON表示设置表空间数据文件的初始化大小","关系创建表空间的语法,下列说法正确的是","v1",0,{"answer":33,"createTime":22,"id":34,"options":35,"question":40,"source":30,"type":31},[],129835012,[36,37,38,39],"每个表只能有一个聚集索引","当定义了唯一约束,则DM数据库会自动给唯一列增加一个非聚集的唯一索引","在DM数据库中定义了主键,则DM会自动的给主键列增加一个非聚集索引","索引的创建可以使用管理工具可视化创建,也可以使用SQL的create index命令创建","下列关于索引说法错误的是",{"answer":42,"createTime":22,"id":43,"options":44,"question":49,"source":30,"type":31},[],129835016,[45,46,47,48],"select a.学号,姓名,count(*) as 选课数,avg(成绩) as 平均分,rank() over(order by avg(成绩) desc) as 排名 from 学生表 a join 选课表 b on a.学号=b.学号 group by a.学号,姓名","select a.学号,姓名,count(*) as 选课数,avg(成绩) as 平均分,rank() over(order by avg(成绩) asc) as 排名 from 学生表 a join 选课表 b on a.学号=b.学号 group by a.学号,姓名 having count(*)>=10","select a.学号,姓名,count(*) as 选课数,avg(成绩) as 平均分,rank() over(order by avg(成绩) desc) as 排名 from 学生表 a join 选课表 b on a.学号=b.学号 group by a.学号,姓名 having count(*)>=10","select a.学号,姓名,count(*) as 选课数,avg(成绩) as 平均分,rank() over(order by avg(成绩) asc) as 排名 from 学生表 a join 选课表 b on a.学号=b.学号 group by a.学号,姓名","有学生表(学号,姓名,性别,生日,籍贯)和选课表(学号,课号,选课时间,成绩),现要求统计筛选修10门以上课程的学生学号、姓名、选课数、平均分和排名,排名依据平均分由高至低排,其SQL语句为",{"answer":51,"createTime":22,"id":52,"options":53,"question":57,"source":30,"type":31},[],129835017,[54,55,56],"char(18)","varchar(18)","varchar(54)","当要在表对象中存储身份证号,那么最好将存储身份证号的属性列定义为",{"answer":59,"createTime":22,"id":60,"options":61,"question":66,"source":30,"type":31},[],129835018,[62,63,64,65],"insert into是表数据插入命令","drop table是表数据删除命令","update是表数据修改命令","delete是表数据删除命令","下列关于表数据更新说法错误的是",{"answer":68,"createTime":22,"id":69,"options":70,"question":74,"source":30,"type":31},[],129835019,[71,72,73],"select * from 学生表 where year(getdate())-year(生日)>=25","select * from 学生表 where 生日>='1997-01-01'","select * from 学生表 where 生日>=25","有学生表(学号,姓名,性别,生日,籍贯),要查询25岁以上学生的信息,可以使用如下哪个语句",{"answer":76,"createTime":5,"id":77,"options":78,"question":83,"source":30,"type":31},[],129835023,[79,80,81,82],"这是修改表空间的命令","alter tablespace ts_stud resize datafile 'd:\\data\\datafile1.dbf' to 200表示将ts_stud表空间的数据文件datafile1的文件最大大小改为200","alter tablespace add datafile是向表空间增加一个数据文件","alter tablespace resize datafile为修改表空间文件大小","下列对于alter tablespace命令说法错误的是",{"answer":85,"createTime":5,"id":86,"options":87,"question":92,"source":30,"type":31},[],129835024,[88,89,90,91],"该查询有语法错误,不能得到结果","该查询筛选出商品编号为10001的销售信息","通过该查询销售数量和销售单价可以得到该商品的销售额","该查询包含了销售表中关于商品编号为10001的商品销售情况","有销售表(销售编号,商品编号,销售数量,销售单价,销售日期),对该表执行如下查询:select * from 销售表 where 商品编号='10001',对于该查询说法错误的是",{"answer":94,"createTime":5,"id":95,"options":96,"question":101,"source":30,"type":31},[],129835028,[97,98,99,100],"该查询将得到所有学生的学号、姓名、课号和成绩","该查询将得到所有学生的学号、姓名及排名","该查询将得到每门课程排名前三的学生的学号、姓名及课程的成绩排名","以上答案均不对","有如下语句:with temp_tableas(select a.学号,a.姓名, row_number() over(partition by 课号 order by 成绩 desc) as rank from 学生表 a join 选课表 b on a.学号=b.学号)select * from temp_table where rank<=3关于该SQL语句说法正确的是",{"answer":103,"createTime":5,"id":6,"options":104,"question":18,"source":30,"type":31},[],[8,9,10]]