数据库（八）

上一节小练习：

存储过程 

    存储过程是一组为了完成特定功能的SQL语句集，经编译后存储在数据库中。用户通过指定存储过程的名字并给出参数来执行它。

注：return要放在if里或者放到最下，否则会影响下面代码执行，因为遇到return就会中断存储过程

--------带语句带参数的存储过程
alter proc fourproc
@name varchar(20)
as
begin
declare @jscode int,@kecheng varchar(20)
select @jscode=bianhao,@kecheng=kecheng from jiaoshibiao where xingming=@name

declare @count int

if @kecheng='语文'
begin
select @count=count(*) from fenshubiao where xuehao in (
select xuehao from xueshengxinxi where yuwenbianhao=(select bianhao from jiaoshibiao where xingming=@name)
) and yuwenfenshu>=80
end
if @kecheng='数学'
begin
select @count=count(*) from fenshubiao where xuehao in (
select xuehao from xueshengxinxi where shuxuebianhao=(select bianhao from jiaoshibiao where xingming=@name)
) and shuxuefenshu>=80
end
if @kecheng='英语'
begin
select @count=count(*) from fenshubiao where xuehao in (
select xuehao from xueshengxinxi where yingyubianhao=(select bianhao from jiaoshibiao where xingming=@name)
) and yingyufenshu>=80
end

if @count>=3
begin
print '达标'
end
else
begin
print '不达标'
end

end
go
exec fourproc '老王'

练习：

-----输入学号，判断学生结业、优秀、不结业、
create proc fiveproc
@xuehao int
as
begin
declare @yuwenfenshu int,
@shuxuefenshu int,
@yingyufenshu int,
@zongfen int

select @yuwenfenshu=COUNT(*)from fenshubiao where xuehao=@xuehao and yuwenfenshu>=60
select @shuxuefenshu=COUNT(*)from fenshubiao where xuehao=@xuehao and shuxuefenshu>=60
select @yingyufenshu=COUNT(*)from fenshubiao where xuehao=@xuehao and yingyufenshu>=60
set @zongfen=@yuwenfenshu+@shuxuefenshu+@yingyufenshu
if @zongfen=3
begin
print '优秀'
end
if @zongfen=2
begin
print '结业'
end
if @zongfen=1
begin
print '不结业'
end
if @zongfen=0
begin
print '重修'
end
end
go
exec fiveproc 201106001