create table StudentList(
id int Identity(1,1) not null,
Name nvarchar(20) not null,
Sex bit not null,
Birthday date not null,
Class nvarchar(2) not null,
Grade nvarchar(2) not null,
regdate date not null,
Primary key (id));
create table ScoreInfo(
id int Identity(1,1) not null primary key,
StudentID int not null,
ClassID int not null,
Score int not null,
TestDate date not null,
regdate date not null);
insert into StudentList(Name, Sex, Birthday, Class, Grade, regdate) values('张三', 1, '1988-05-28', 1, 8, '2010-05-05');
insert into StudentList(Name, Sex, Birthday, Class, Grade, regdate) values('李四', 1, '1985-09-13', 4, 4, '2010-05-05');
insert into StudentList(Name, Sex, Birthday, Class, Grade, regdate) values('王丽', 0, '1987-11-05', 1, 7, '2010-05-05');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(1, 1, 98, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(1, 2, 92, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(1, 3, 86, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(2, 1, 95, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(2, 2, 94, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(2, 3, 91, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(3, 1, 90, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(3, 2, 88, '2010-04-15', '2010-05-01');
insert into ScoreInfo(StudentID, ClassID, Score, TestDate, regdate) values(3, 3, 90, '2010-04-15', '2010-05-01');
Cross Apply把语句两边的两个Select查询结果进行交叉配对，将所有结果展示出来。Cross Apply查询确保在查询两个子集数据的交集时，只有有效信息的集合才被列出来。
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