sqlserver 分支语句及索引

 //显示器，键盘，鼠标，内存条 display,keyboard,mouse

SELECT
     产品号 as productid,
     productname =
      CASE 产品名称
         WHEN '显示器' THEN 'display'
         WHEN '键盘' THEN 'keyboard'
         WHEN '鼠标' THEN 'mouse'
         WHEN '内存条' THEN 'memory'
         ELSE '尚未分类'
      END,

    供应商号 as supplierid,
    价格 as price,库存 as stocks
  

    
FROM 产品

go

/*3 将显示器，键盘，鼠标，内存条的价格分别上调8%，7%，6%，5%*/

update 产品 set 价格=价格*1.08 where 产品号=001

update 产品 set 价格=价格*1.07 where 产品号=002

update 产品 set 价格=价格*1.06 where 产品号=003

update 产品 set 价格=价格*1.05 where 产品号=004

 

update 产品
set 价格=
case  
   when  产品号='001' then 价格*1.08
   when  产品号='002' then 价格*1.07
   when  产品号='003' then 价格*1.06
   else 价格*1.05
end
select *
from 产品

 

create table course

(
  course_id char(6)  not null primary key,
  course_name varchar(20) not null,
  course_hours int not null,
  course_credit float(6) not null
)
go

create table grade
(
 grade_id char(10) not null,
 course_id  char(6) not null
 foreign key (course_id) references course(course_id),
 course_name varchar(20) not null,
 mark int,
 makeup int
)

go

alter table grade
add constraint  pk_grade primary key (grade_id,course_id)
go  

create table empleoyee
(
empid int not null primary key,
empname varchar(10) not null,
sex char(2) not null,
department varchar(20) not null,
job varchar(20) not null,
startdate datetime not null,
gongling as datediff(yy,startdate,getdate()), 
tel varchar(11)
)
go 

insert into course values('030110','面向对象数据库基础',30,3.4)
insert into course values('030111','计算机网络',32,2)
insert into course values('030112','数据仓库',24,2)
insert into course values('030113','近世代数',16,1)
insert into course values('030114','计算机高新计术',1)

select * from course

insert into grade values('050310','030111',45,65)
insert into grade(grade_id,course_id,course_name,mark) values('050311',80)
insert into grade(grade_id,mark) values('050312',84)
insert into grade values('050313',56,75)
insert into grade(grade_id,mark) values('0503114',91)

 

insert into empleoyee(empid,empname,sex,department,job,tel) values(1,'wang','m','sqlserver','teacher','1989-01-01','1234567890')

select * from empleoyee

 

create index 成绩_课程号学号_index1 on  grade( course_id,grade_id)
go
create index 成绩_成绩_index1 on  grade(mark)
go

sp_helpindex grade
go

sp_rename  'grade.成绩_成绩_index1','成绩_01'

go

sp_rename  'grade.成绩_课程号学号_index1','成绩_02'

go

select * from grade where  mark='84'
drop table grade

sp_helpindex grade
create  index ga on grade(mark)

 

Select  @@SERVERNAME  as 本地服务器

Select getdate() as 'Today''s date and time'