[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fCI6Xi6-SfcL3P5zkzuL5VdqptmkhwRp3cn5XJHsyal8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":21,"type":22},[],"2025-12-22 22:33:02",281042650,[8,9,10,11],"一个基本表可以创建多个索引","索引可以提高数据查询的速度","删除索引可以使用DROP INDEX语句","索引越多越好",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","以下关于索引描述中,错误的是( )",[18,23,32,41,50,59,68,77,86,92],{"answer":19,"createTime":5,"id":6,"options":20,"question":16,"source":21,"type":22},[],[8,9,10,11],"v1",0,{"answer":24,"createTime":5,"id":25,"options":26,"question":31,"source":21,"type":22},[],281042652,[27,28,29,30],"使用CREATE INDEX语句","使用CREATE TABLE语句","使用ALTER TABLE语句","使用CREATE DATABASE语句","下列不能用于创建索引的是( )",{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":21,"type":22},[],281042654,[36,37,38,39],"CREATE TABLE teacher ADD UNIQUE INDEX un_tel(tel)","CREATE INDEX teacher ADD UNIQUE INDEX un_tel(tel)","ALTER TABLE teacher ADD UNIQUE INDEX un_tel(tel)","ALTER TABLE teacher MODIFY UNIQUE INDEX un_tel(tel)","为teacher表的tel列创建一个唯一索引un_tel, 下列SQL语句写法是正确的是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":21,"type":22},[],281042656,[45,46,47,48],"按成绩降序创建了一个普通索引","按成绩升序创建了一个普通索引","按成绩降序创建了一个全文索引","按成绩升序创建了一个全文索引","已知关系student(sid,sname,grade),以下关于命令"CREATE INDEX s ON student(grade)"的描述,正确的是( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":21,"type":22},[],281042658,[54,55,56,57],"Ⅰ","Ⅱ","Ⅰ、Ⅱ","都不能","设S_AVG(SNO,AVG_GRADE)是一个基于关系SC定义的学号及其平均成绩的视图,下面对该视图的操作语句中,( )是能正确执行的.Ⅰ.UPDATE S_AVG SET AVG_GRADE=90 WHERE SNO='2004010601'Ⅱ.SELECT SNO, AVG_GRADE FROM S_AVG WHERE SNO='2004010601'",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":21,"type":22},[],281042659,[63,64,65,66],"更新视图数据","查询","在视图上定义新的基本表","在视图上定义新视图","在视图上不能完成的操作是( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":21,"type":22},[],281042662,[72,73,74,75],"Ⅰ、Ⅱ或Ⅲ","Ⅰ或Ⅲ","Ⅱ或Ⅲ","Ⅰ或Ⅱ","视图是一个"虚表",视图的构造基于( ).Ⅰ.基本表 Ⅱ.视图 Ⅲ.索引",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":21,"type":22},[],281042664,[81,82,83,84],"DROP VIEW view_teacher","DELETE VIEW view_teacher","REMOVE VIEW view_teacher","CLEAR VIEW view_teacher","若要删除视图view_teacher,下列SQL语句正确的是( )",{"answer":87,"createTime":5,"id":88,"options":89,"question":90,"source":21,"type":91},[],281042666,[],"在SQL中,可以使用CREATE ____创建视图",2,{"answer":93,"createTime":5,"id":94,"options":95,"question":96,"source":21,"type":91},[],281042668,[],"如果要删除student表上的index_sfzh索引,可以使用"DROP ____index_sfzh ON student"SQL语句实现"]