MySchool 03 编程上机练习 上机和打印直角三角形

//if-lse经典案例  
--统计并显示2013-08-09 的oop考试平均分  
--如果平均分在70以上，显示“考试成绩优秀”，并显示前三名学生的考试信息  
--如果在70分以下，显示“考试成绩较差”，并显示后三名学生的考试信息  
--01.定义一个变量，保存平均分  

select * from Result  
--查编号  
declare @subid int   
select @subid=SubjectId from Subject  
where subjectname='oop'   
--查询平均分  
declare @avg int  
select @avg=avg(Studentresult)from result  
where examdate>='2013-08-09' and examdate<'2013-08-10' and SubjectId=@subid  
--前三名  
if(@avg>=70)  
begin  
print '成绩优秀'  
select top 3 * from Result  where examdate>='2013-08-09' and ExamDate<'2013-08-10' and SubjectId=@subid  
order by StudentResult desc  
end  
if(@avg<70)  
begin  
print '考试成绩较差'  
select top 3 * from Result  where examdate>='2013-08-09' and ExamDate<'2013-08-10' and SubjectId=@subid  
order by StudentResult   
end  
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//while经典案例  
--科目名为oop的id  
declare @subid int  
select @subid=SubjectId from subject  
where SubjectName='oop'  
print @subid   
--科目名为oop的最近考试时间  
declare @maxdate datetime  
select @maxdate=MAX(examdate) from Result  
where SubjectId=@subid   
--符合条件的学生信息  
select * from Result  
where SubjectId=@subid and ExamDate=@maxdate   
--分数小于70分的人数  
declare @sum int  
select @sum= COUNT(StudentNo)from Result  
where StudentResult<70 and SubjectId=@subid and ExamDate=@maxdate   
--当分数小于70分的人数大于0,每个人加2,95分以上不加,直至每个人的分数达到平均分  
while(@sum>0)  
begin  
--更新分数  
update result set studentresult+=2  
where subjectid=@subid and  examdate=@maxdate and studentresult<95  
--重新给分数小于70分的人数赋值  
select @sum=COUNT(Studentno) from Result  
where subjectid=@subid and  examdate=@maxdate and studentresult<70  
end  
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//第三章上机题  
--上机1  
declare @name nvarchar(255)  
set @name='★'  
declare @int int  
set @int=1  
while(@int<6)  
begin  
print @name  
set @name+='★'  
set @int+=1  
end  
go  
--上机2  
select studentno as '学号',StudentName as '姓名',FLOOR(DATEDIFF(dy,birthday,getdate())/365) as '年龄' from dbo.Student where studentno='23225'  
declare @yy int  
select @yy=DATEPART(YY,birthday) from student where studentno='23225'  
select * from student where DATEPART(YY,birthday)=@yy+1 or DATEPART(YY,birthday)=@yy-1  
go  
--上机3  
select top 1 studentname,studentresult from student,result,subject where student.studentno='23219' and subject.subjectid=2  
declare @result int  
select @result=studentresult from student,result,subject where student.studentno='23219' and subject.subjectid=2  
if(@result>85)  
print '优秀'  
else if(@result>70)  
print '良好'  
else if(@result>60)  
print '中等'  
else  
print '差'   
--上机4  
--科目名为oop的id  
declare @subid int  
select @subid=SubjectId from subject  
where SubjectName='oop'  
print @subid    
--科目名为oop的最近考试时间  
declare @maxdate datetime  
select @maxdate=MAX(examdate) from Result  
where SubjectId=@subid  
--根据课程oop最近一次考试,显示每个学生的等级  
select 学号=StudentNo,课程编号=SubjectId, 成绩=StudentResult, 等级=case  
when StudentResult>90 then '★★★★'  
when StudentResult between 80 and 89 then '★★★'  
when StudentResult between 70 and 79 then '★★'  
when StudentResult between 60 and 69 then '★'  
else '你要努力了'  
end  
from Result   
where subjectid=@subid and  examdate=@maxdate 
--分数小于70分的人数  
declare @sum int  
select @sum= COUNT(StudentNo)from Result  
where StudentResult<70 and SubjectId=@subid and ExamDate=@maxdate  --当分数小于70分的人数大于0,每个人加2,直至每个人的分数达到平均分,若成绩大于100分,则按100分计算  
while(@sum>0)  
begin  
--更新分数  
update result set studentresult+=2  
where subjectid=@subid and  examdate=@maxdate   
update result set studentresult=100  
where subjectid=@subid and  examdate=@maxdate and studentresult>100  
--重新给分数小于70分的人数赋值  
select @sum=COUNT(Studentno) from Result  
where subjectid=@subid and  examdate=@maxdate and studentresult<70  
end  
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//SQL面试题  
--创建表  
use MySchool  
create table tmp  
(  
rp varchar(10),  
shengfu nchar(1)  
)  
--插入数据  
insert into tmp values('2005-5-9','胜')  
insert into tmp values('2005-5-9','胜')  
insert into tmp values('2005-5-9','负')  
insert into tmp values('2005-5-9','负')  
insert into tmp values('2005-5-10','胜')  
insert into tmp values('2005-5-10','负')  
insert into tmp values('2005-5-10','负')  
select rp as 日期,  
SUM(  
case   
 when shengfu='胜' then 1  
 else 0  
 end  
) as 胜,  
SUM(  
case   
  when shengfu='负' then 1  
  else 0  
  end  
  ) as 负  
from tmp  
group by rp  
order by rp desc   
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//SQL语句打印直角三角形  
---单层循环  
declare @str nvarchar(32)  
set @str='*'  
declare @num int  
set @num=1  
while(@num<5)  
begin  
print @str  
set @str+='*'  
set @num+=1  
end  
--双层循环   
declare @number int  
set @number=1  
declare @sum int  
set @sum=1  
declare @stri nvarchar(32)  
set @stri=''  
while(@number<=5)  
begin  
while(@sum<@number)  
begin  
set @stri+='*'  
set @sum+=1  
end  
print @stri  
set @number+=1  
end