sql面试题的.doc

Sql常见面试题（总结）1.用一条SQL语句 查询出每门课都大于80分的学生姓名? name?? kecheng?? fenshu 张三???? 语文?????? 81张三???? 数学?????? 75李四???? 语文?????? 76李四???? 数学?????? 90王五???? 语文?????? 81王五???? 数学?????? 100王五???? 英语?????? 90A: select distinct name from table? where? name not in (select distinct name from table where fenshu=80)2.学生表 如下:自动编号?? 学号?? 姓名 课程编号 课程名称 分数1??????? 2005001? 张三? 0001????? 数学??? 692??????? 2005002? 李四? 0001????? 数学??? 893??????? 2005001? 张三? 0001????? 数学??? 69删除除了自动编号不同,其他都相同的学生冗余信息A: delete tablename where 自动编号 not in(select min(自动编号) from tablename group by 学号,姓名,课程编号,课程名称,分数) 一个叫department的表，里面只有一个字段name,一共有4条纪录，分别是a,b,c,d,对应四个球对，现在四个球对进行比赛，用一条sql语句显示所有可能的比赛组合.你先按你自己的想法做一下，看结果有我的这个简单吗？select a.name, b.name from team a, team b where a.name b.name 请用SQL语句实现：从TestDB数据表中查询出所有月份的发生额都比101科目相应月份的发生额高的科目。请注意：TestDB中有很多科目，都有1－12月份的发生额。AccID：科目代码，Occmonth：发生额月份，DebitOccur：发生额。数据库名：JcyAudit，数据集：Select * from TestDBselect a.*from TestDB a ,(select Occmonth,max(DebitOccur) Debit101ccur from TestDB where AccID=101 group by Occmonth) bwhere a.Occmonth=b.Occmonth and a.DebitOccurb.Debit101ccur ************************************************************************************ 面试题：怎么把这样一个表儿year??month amount1991?? 1???? 1.11991?? 2???? 1.21991?? 3???? 1.31991?? 4???? 1.41992?? 1???? 2.11992?? 2???? 2.21992?? 3???? 2.31992?? 4???? 2.4查成这样一个结果year m1??m2??m3??m41991 1.1 1.2 1.3 1.41992 2.1 2.2 2.3 2.4 答案一、select year, (select amount from??aaa m where month=1??and m.year=aaa.year) as m1,(select amount from??aaa m where month=2??and m.year=aaa.year) as m2,(select amount from??aaa m where month=3??and m.year=aaa.year) as m3,(select amount from??aaa m where month=4??and m.year=aaa.year) as m4from aaa??group by year 这个是ORACLE??中做的：select * from (select name, year b1, lead(year) over(partition by name order by year) b2, lead(m,2) over(partition by name order by year) b3,rank()over(partition by name order by year) rk from t) where rk=1;精妙的SQL语句！精