sql学习2

 use nanwang

go

/*创建一个goods表，该表记录了货品的代号，名称，描述，库存量，供应商，状态，价格等信息*/

/*说明下，此表因为没有建立两个。。所以。。二次查询。。等一些都没有后期会不上去的*/

create table Goods

(gid smallint primary key,

Gname varchar(20) not null,

Description varchar(100) not null,

Storage int,

Supplier varchar(50),

Status tinyint Default(0),

Price money

)

go

select *from goods

go

use nanwang

insert into Goods(gid,Gname,Description,Storage,Supplier,Status) 

values ('1','nanwang','nanwang','10','zhongfei','0')

insert into Goods(gid,Gname,Description,Storage,Supplier,Status) 

values ('2','nanfei','nanfei','10','zhongnan','0')

insert into Goods(gid,Gname,Description,Storage,Supplier,Status) 

values ('3','dadao','nanfei','5','chenglong','0')

go

 

select gname,storage from goods 

go

select gname,description,storage,price from goods where storage>3

select gname,description,storage,price from goods where storage>6

go

/*between ..and。。是包含，and是不包含*/

select gname,description,storage,price from goods where storage between 6 and 10

select gname,description,storage,price from goods where storage>6 and storage<10

go

select gname from goods where description='nanfei'

go

select gname,description,storage,price from goods where gname like 'N%'

select gname,description,storage,price from goods where gname like '%i'

select gname,description,storage,price from goods where gname like 'n[a]n%'

select gname,description,storage,price from goods where gname like '[^n]%'

select * from goods

go

select *gname,description,storage,price from goods where gname like

go

select avg(storage) as '库存' from goods

select min(storage) as '库存' from goods

select sum(storage) as '库存' from goods

select count(storage) as '库存' from goods