[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fjjh6LYpU2BtErODPbfbpWTWjGmB3qoTGa3RtQRlraBs":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-05-15 20:27:26",143819393,[8,9,10,11],"select count(*) from user","select count(id) from user","select count(username) from user","select count(1) from user",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},21,"3e8654769bc1e047331b88e85be2a882","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c1e48361b00f3ee2086f4e259ed792b.jpg","数据库管理与应用","work_35001997","第七、八周作业","用户表user有多列,其中字段id中没有null值,字段username中存在null值,以下SQL语句不能获得user表的总记录数的是那一个?( )",[21,33,42,51,60,69,78,87,90,99],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-05-15 20:27:25",143819382,[26,27,28,29],"%","*","#","_","在使用SQL语句查询数据时,若想要使用Like关键字来匹配单个字符,那么其通配符是( )","v1",0,{"answer":34,"createTime":5,"id":35,"options":36,"question":41,"source":31,"type":32},[],143819383,[37,38,39,40],"group by","order by","distinct","desc","在select语句中,如果要过滤结果集中的重复行,可以在字段列表前面加上( )",{"answer":43,"createTime":5,"id":44,"options":45,"question":50,"source":31,"type":32},[],143819384,[46,47,48,49],"delete from emp WHERE name='dony'","delete * from emp WHERE name='dony'","Drop from emp WHERE name='dony'","Drop * from emp WHERE name='dony'","以下删除记录正确的( )",{"answer":52,"createTime":5,"id":53,"options":54,"question":59,"source":31,"type":32},[],143819385,[55,56,57,58],"SELECT MAX(成绩) FROM A GROUP BY 学科 HAVING MAX(成绩)>80","SELECT 学科 FROM A GROUP BY 学科 HAVING 成绩>80","SELECT 学科 FROM A GROUP BY 学科 HAVING MAX(成绩)>80","SELECT 学科 FROM A GROUP BY 学科 WHERE MAX(成绩)>80","例如数据库中有A表,包括学生、学科、成绩三个字段,数据库结构为: 学生 学科 成绩 张三 语文 60 张三 数学 100 李四 语文 70 李四 数学 80 李四 英语 80 张三 语文 60 如何统计最高分>80的学科?( )",{"answer":61,"createTime":5,"id":62,"options":63,"question":68,"source":31,"type":32},[],143819387,[64,65,66,67],"WHERE sName ! NULL","WHERE sName NOT NULL","WHERE sName IS NOT NULL","WHERE sName != NULL","查找条件为:姓名sName不是NULL的记录( )",{"answer":70,"createTime":5,"id":71,"options":72,"question":77,"source":31,"type":32},[],143819389,[73,74,75,76],"包括20岁不包括30岁","不包括20岁包括30岁","不包括20岁和30岁","包括20岁和30岁","条件"BETWEEN 20 AND 30"表示年龄在20到30之间,且( )",{"answer":79,"createTime":5,"id":80,"options":81,"question":86,"source":31,"type":32},[],143819391,[82,83,84,85],"第2~4条记录","第3~4条记录","第2~5条记录","第3~6条记录","LIMIT 2,4表示的是( )",{"answer":88,"createTime":5,"id":6,"options":89,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":91,"createTime":5,"id":92,"options":93,"question":98,"source":31,"type":32},[],143819395,[94,95,96,97],"age <= 22 AND age >= 20","age < 22 AND age > 20","age = 20 AND age = 22","age = 20 OR age = 22","SQL中,"age IN (20, 22)"的语义是( D)",{"answer":100,"createTime":5,"id":101,"options":102,"question":107,"source":31,"type":32},[],143819397,[103,104,105,106],"Order By","Where","Group By","无需配合","Select语句中与having子句同时使用的是( )子句"]