[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f-w5vLQUcFPjo0WIPYBCey4KyrryPC_CxcuoNKAdRbeI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":12,"related":13,"source":23,"type":93},[],"2025-12-22 22:33:02",281042668,[],{"courseId":9,"courseImg":10,"courseName":11},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","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",[14,25,34,43,52,61,70,79,88,94],{"answer":15,"createTime":5,"id":16,"options":17,"question":22,"source":23,"type":24},[],281042650,[18,19,20,21],"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","以下关于索引描述中,错误的是( )","v1",0,{"answer":26,"createTime":5,"id":27,"options":28,"question":33,"source":23,"type":24},[],281042652,[29,30,31,32],"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":35,"createTime":5,"id":36,"options":37,"question":42,"source":23,"type":24},[],281042654,[38,39,40,41],"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":44,"createTime":5,"id":45,"options":46,"question":51,"source":23,"type":24},[],281042656,[47,48,49,50],"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":53,"createTime":5,"id":54,"options":55,"question":60,"source":23,"type":24},[],281042658,[56,57,58,59],"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":62,"createTime":5,"id":63,"options":64,"question":69,"source":23,"type":24},[],281042659,[65,66,67,68],"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":71,"createTime":5,"id":72,"options":73,"question":78,"source":23,"type":24},[],281042662,[74,75,76,77],"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":80,"createTime":5,"id":81,"options":82,"question":87,"source":23,"type":24},[],281042664,[83,84,85,86],"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":89,"createTime":5,"id":90,"options":91,"question":92,"source":23,"type":93},[],281042666,[],"在SQL中,可以使用CREATE ____创建视图",2,{"answer":95,"createTime":5,"id":6,"options":96,"question":12,"source":23,"type":93},[],[]]