SQL查询GROUP BY

-1

我有以下的记录和值：SQL查询GROUP BY

create table student (
    LastName  varchar(40), 
    FirstName  varchar(40), 
    SID   number(5), 
    SSN   number(9), 
    Career  varchar(4), 
    Program  varchar(10), 
    City   varchar(40), 
    Started  number(4), 

    primary key (SID), 
    unique(SSN) 
); 

create table enrolled (
    StudentID  number(5), 
    CourseID  number(4), 
    Quarter  varchar(6), 
    Year   number(4), 

    primary key (StudentID, CourseID), 
    foreign key (StudentID) references student(SID), 
    foreign key (CourseID) references course(CID) 
); 

insert into student 
    values ('Brennigan', 'Marcus', 90421, 987654321, 'UGRD', 'COMP-GPH', 'Evanston', 2001); 
insert into student 
    values ('Patel', 'Deepa', 14662, null, 'GRD', 'COMP-SCI', 'Evanston', 2003); 
insert into student 
    values ('Snowdon', 'Jonathan', 08871, 123123123, 'GRD', 'INFO-SYS', 'Springfield', 2005); 
insert into student 
    values ('Starck', 'Jason', 19992, 789789789, 'UGRD', 'INFO-SYS', 'Springfield', 2003); 
insert into student 
    values ('Johnson', 'Peter',5, 123456789, 'UGRD', 'COMP-SCI', 'Chicago', 2004); 
insert into student 
    values ('Winter', 'Abigail', 11035, 111111111, 'GRD', 'PHD', 'Chicago', 2003); 
insert into student 
    values ('Patel', 'Prakash', 75234, null, 'UGRD', 'COMP-SCI', 'Chicago', 2001); 
insert into student 
    values ('Snowdon', 'Jennifer', 93321, 321321321, 'GRD', 'COMP-SCI', 'Springfield', 2004); 

insert into enrolled 
    values (11035, 1020, 'Fall', 2005); 
insert into enrolled 
    values (11035, 1092, 'Fall', 2005); 
insert into enrolled 
    values (11035, 8772, 'Spring', 2006); 
insert into enrolled 
    values (75234, 3201, 'Winter', 2006); 
insert into enrolled 
    values (08871, 1092, 'Fall', 2005); 
insert into enrolled 
    values (90421, 8772, 'Spring', 2006); 
insert into enrolled 
    values (90421, 2987, 'Spring', 2006);

我的目标是：清单（对）已采取同班同学一起。

预期输出：

StudentID COURSEID 
11035 1092 
8871 1092 
11035 8772 
90421 8772

我怎样才能做到这一点？

感谢，

来源

2013-04-25 Sohel Mansuri

哪个是你的数据库？ – TechDo 2013-04-25 06:52:09

我使用Oracle SQL Developer。 – 2013-04-25 06:53:11

创建脚本中缺少表格“课程”。 – TechDo 2013-04-25 06:54:46

请尝试查询：

select * from(
    select a.FirstName, a.LastName, b.StudentID, b.COURSEID, count(*) over (partition by b.COURSEID) CNum 
    from STUDENT a inner join enrolled b on a.SID=b.StudentID 
) x where CNum=2

来源

2013-04-25 07:22:24 TechDo

SQL查询GROUP BY

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