初学Oracle，请教个各位老师们个题目，感激不尽
有两张表：
表 1
STUDNAME COURSENAME CSCORE USCORE
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jack A 80 1
jack B 60 5
jack C 70 3
rose A 95 1
rose B 85 5
rose C 75 3
lucy A 45 1
lucy B 55 5
lucy C 50 3
lily A 25 1
lily B 15 5
lily C 10 3
表2
姓名 A B C 总学分
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jack 80 60 70 9
rose 95 85 75 9
lucy 45 55 50 9
lily 25 15 10 9
1. 从表1获取数据，格式化输出为表2。
2. 从表2读取数据，格式化输出为表1。
PS： 脚本关键语句最好有注释
[解决办法]
create table t1 (STUDNAME varchar2(20), COURSENAME varchar2(10), CSCORE number(3), USCORE number(5));insert into t1 values ('jack','A',80,1);insert into t1 values ('jack','B',60,5);insert into t1 values ('jack','C',70,3);insert into t1 values ('rose','A',95,1);insert into t1 values ('rose','B',85,5);insert into t1 values ('rose','C',75,3);insert into t1 values ('lucy','A',45,1);insert into t1 values ('lucy','B',55,5);insert into t1 values ('lucy','C',50,3);insert into t1 values ('lily','A',25,1);insert into t1 values ('lily','B',15,5);insert into t1 values ('lily','C',10,3);select STUDNAME, sum(decode(COURSENAME,'A',CSCORE,0)) A, --判断每行的科目和成绩 根据姓名合并多行各科成绩 sum(decode(COURSENAME,'B',CSCORE,0)) B, sum(decode(COURSENAME,'C',CSCORE,0)) C, sum(USCORE) USCOREfrom t1group by STUDNAME STUDNAME A B C USCORE-------------------------------------------------1 rose 95 85 75 92 jack 80 60 70 93 lucy 45 55 50 94 lily 25 15 10 9