SQL 存储过程使用

use master;    --切换到master数据库
go

create database stuDB
go

use stuDB    --选择当前数据库
go

CREATE TABLE StuInfo --创建学生信息表
(
    StuNo varchar(12) primary key,
    StuName varchar(20) not null ,
    StuAge int check(StuAge>=0 and StuAge<=120),
    StuSex char(2) check(StuSex='男' or StuSex='女') default('男'),
    StuTel varchar(15),
    StuAddress varchar(50) default ('地址不详'),
    StuEmail varchar(50),
    birthday date,
    classname varchar(12)
)
go

CREATE TABLE Exam --创建学生成绩表
(
    ExamNo int primary key identity(1,1),
    StuNo varchar(12) foreign key references StuInfo(StuNo),
    Written decimal(10,2) check(Written>=0 and Written<=100),
    Lab decimal(10,2) check(Lab>=0 and Lab<=100)
)
go

--插入数据
insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13580901028','周文学','90-03-17','2222273','湖南衡阳','Y2T116');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550715006','陈辉煌','82-10-10','13588912530','江西全南县','Y2T48');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550808001','曾华军','86-08-22','13583020539','广东珠海','Y2T49');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13551219034','罗燕','83-11-07','13578696856','云南省潞西市','Y2T65');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550815003','黄志伟','87-11-13','13643088892','江西会昌县','Y2T50');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550815004','涂乾文','86-07-22','2228852','广东珠海','Y2T50');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550815015','唐宁','81-07-01','13812309868','广东珠海','Y2T50');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550826003','贝然','85-06-13','13882202173','广东珠海','Y2T60');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550808019','白生全','86-06-03','8828888','重庆','Y2T49');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13540925028','沈永强','81-06-23','13588065815','江苏南通市','Y2T50');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('21750710010','张键','85-07-18','8557378','广东江门','Y2T50');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550906016','吴家彬','82-09-22','8324282','珠海市斗门区','Y2T52');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550912004','邹城廷','85-10-15','8218358','广东珠海','Y2T53');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13540706014','娄智欣','85-09-21','8545256','江西峡江','Y2T42');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550304010','陈迪华','00-01-01','5612698','广东珠海','Y2T42');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550321013','陈福清','80-11-25','13751861125','江西于都县','Y2T42');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13551228001','陶正武','83-06-19','13824151800','湖南益阳市','Y2T42');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13540607014','杨振杰','75-08-10','13800138000','珠海','Y2A21');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550418023','鲁力','82-03-23','13727003870','广东珠海','Y2T44');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550513026','贺际勇','80-11-06','2628682','湖南常德市','Y2T44');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('51451226001','刘峰','82-02-06','8385613','湖南衡阳市','Y2T44');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550531024','陈学斌','82-02-03','8358801','广东珠海','Y2T45');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550531001','郑银河','81-08-26','13697788878','湖南隆回县','Y2T47');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550715014','陈卓','86-08-30','2210387','江西省于都县','Y2T47');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550715019','贾海波','85-04-10','13539599336','湖南蓝山县','Y2T47');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550912006','钟文康','84-05-15','13750086179','广东珠海市','S2T53');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13550912007','朱婉婷','83-08-11','13527719983','广东珠海','Y2T53');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13551011008','易虎','84-02-28','13631237777','四川安岳县','Y2T56');

insert into stuinfo (stuno,stuName,birthday,stutel,stuAddress,classname)
values('13551011013','陈挺','84-05-19','13433677109','珠海香洲','S2T56');


--插入成绩表
insert into Exam values('13540607014',95,86);
insert into Exam values('13540706014',55,56);
insert into Exam values('13540925028',65,86);
insert into Exam values('13550304010',60,60);
insert into Exam values('13550321013',89,null);
insert into Exam values('13550418023',91,60);
insert into Exam values('13550513026',60,76);
insert into Exam values('13550531001',null,null);
insert into Exam values('13550531024',null,86);
insert into Exam values('13550715006',54,46);
insert into Exam values('13550715014',46,76);
insert into Exam values('13550715019',32,86);
insert into Exam values('13550808001',86,36);

--查询数据
select * from stuinfo
select * from Exam

--创建存储过程
create proc proc_stuInfo
as 
   select * from StuInfo
go

--调用存储过程
exec proc_stuInfo
go

--创建存储过程
create proc Proc_passStu
as
 select stuname,stuage,stusex,stuADDress,written,Lab
from  StuInfo s ,Exam e where s.StuNo=e.StuNo
go

--调用存储过程
exec Proc_passStu
go
 select stuname,stuage,stusex,stuADDress,written,Lab
from  StuInfo s ,Exam e where s.StuNo=e.StuNo


--创建带输入参数的存储过程
create proc proc_passStu1
@written int,
@Lab int
as
 select stuname,stuage,stusex,stuADDress,written,Lab
from  StuInfo s ,Exam e where s.StuNo=e.StuNo
and written>=@written and Lab>=@Lab
go

--调用带参存储过程
exec proc_passStu1 60,60
go

--创建带输入参数并赋默认值的存储过程
create proc proc_passStu2
@written int=60,
@Lab int=60
as
 select stuname,stuage,stusex,stuADDress,written,Lab
from  StuInfo s ,Exam e where s.StuNo=e.StuNo
and written>=@written and Lab>=@Lab
go


--调用存储过程
exec proc_passStu2
exec proc_passStu2 70,60

--笔试及格线为70，机试默认60
exec proc_passStu2 70

--笔试及格线默认60，机试及格线为70
exec proc_passStu2 default,70
exec proc_passStu2 @lab=70
go


--创建带输出参数的存储过程
create proc proc_passStu3
@passnum int output
as
   select @passNum=count(*) from Exam
    where Written>=60 and Lab>=60
go


declare @num int
exec proc_passStu3 @num output
print '本次及格人数：'+convert(varchar(5),@num)



--创建带输入参数并赋默认值及输出参数的存储过程
--没有默认值的参数定义在前面比较好
create proc proc_passStu4
@failnum int output,
@written int=60,
@Lab int=60
as
    declare @writtenavg decimal(5,2),@labavg decimal(5,2)
    select @written=AVG(written) from Exam where written is not null
    select @lab=AVG(Lab) from Exam where Lab is not null
    print '笔试平均分'+ convert(varchar(2),@written)
    print '机试平均分'+ convert(varchar(2),@lab)
    
    print '本班考成绩：'+
    case
        when @writtenavg>=70 and @labavg>=70 then '优秀'
        when @writtenavg>=60 and @labavg>=60 then '一般'
        else '较差'
    
    end
    
    print '-------------------------------------------------'
    print '           参加本次考试没有通过的学员'
    print '-------------------------------------------------'
    
        select s.StuName,e.StuNo,written,lab
        from Exam e,StuInfo s where e.StuNo=s.StuNo
        and (written<@written or lab <@Lab)

    select @failnum =count(*)from Exam
    where written<@written or lab <@Lab
    
go
declare @failnum int
exec  proc_passStu4 @failnum output 
print '本次不及格的人数：'+convert(varchar(5),@failnum)
go



--注意条件要加小括号
select StuName,Written,Lab 
from StuInfo s,Exam e
where s.StuNo = e.StuNo 
and (Written<60 or Lab<60)

--使用join就不用
select StuName,Written,Lab 
from StuInfo s join Exam e
on s.StuNo = e.StuNo
where Written<60 or Lab<60