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13
数据库/头歌/AVG() 函数的使用/AVG() 函数的使用.sh
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USE Mall
GO
SET NOCOUNT ON
------ return two columns that the price bigger than average price ------
-- ********** Begin ********** --
SELECT prod_name, prod_price
FROM Products
WHERE prod_price > (SELECT AVG(prod_price) FROM Products)
-- ********** End ********** --
GO

14
数据库/头歌/COUNT() 函数的使用/1. COUNT() 函数的使用.sh
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USE Mall
GO
SET NOCOUNT ON
------ return the number of product which price bigger than 10 -----
-- ********** Begin ********** --
SELECT COUNT(*)
FROM Products
WHERE prod_price > 10
-- ********** End ********** --
GO

22
数据库/头歌/使用WHERE语句进行检索/使用WHERE语句进行检索.sh
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USE Mall
Go
SET NOCOUNT ON
---------- retrieving with range ----------
-- ********** Begin ********** --
SELECT prod_name, prod_price
FROM Products
WHERE prod_price BETWEEN 3 AND 5;
-- ********** End ********** --
GO
---------- retrieving with nomatches ----------
-- ********** Begin ********** --
SELECT prod_name, prod_price
FROM Products
WHERE prod_name <> 'Lion toy';
-- ********** End ********** --
GO

22
数据库/头歌/基本SELECT查询/基本SELECT查询.sh
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USE Mall
GO
SET NOCOUNT ON
---------- retrieving multiple column ----------
-- ********** Begin ********** --
SELECT prod_name, prod_price
FROM Products;
-- ********** End ********** --
GO
---------- retrieving all column ----------
-- ********** Begin ********** --
SELECT *
FROM Products;
-- ********** End ********** --
GO

20
数据库/头歌/带限制条件的查询和表达式查询/带限制条件的查询和表达式查询.sh
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USE Mall
Go
SET NOCOUNT ON
---------- retrieving with limited ----------
-- ********** Begin ********** --
SELECT prod_name
FROM Products
WHERE prod_name LIKE '%toy%'
-- ********** End ********** --
GO
---------- retrieving with expression ----------
-- ********** Begin ********** --
SELECT prod_price, prod_price * 0.8 AS discount_price
FROM Products
WHERE prod_price > 3
-- ********** End ********** --
GO

36
数据库/头歌/数据的更改/数据的更改.sh
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-- ********** create database ********** --
-- ********** Begin ********** --
create database Books
-- ********** End ********** --
go
use Books
go
-- ********** create table ********** --
-- ********** Begin ********** --
create table prices
(
ID int IDENTITY(1,1) not null,
Name varchar(20) not null,
price varchar(30) not null
)
-- ********** End ********** --
go
SET NOCOUNT ON
-- ********** insert ********** --
-- ********** Begin ********** --
insert into prices (Name, price) values ('Harry Potter', '$128')
insert into prices (Name, price) values ('Walden', '$5')
-- ********** End ********** --
go
SET NOCOUNT ON
-- ********** update ********** --
-- ********** Begin ********** --
update prices set price = '$6' where Name = 'Walden'
-- ********** End ********** --
go

13
数据库/头歌/通配符%的使用/1. 通配符%的使用.sh
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USE Mall
Go
SET NOCOUNT ON
---------- retrieving with wildcard % ----------
-- ********** Begin ********** --
SELECT prod_id, prod_name, prod_price
FROM Products
WHERE prod_name LIKE '%toy%'
-- ********** End ********** --
GO

15
数据库/头歌/通配符_的使用/通配符_的使用.sh
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@ -1,15 +0,0 @@
USE Mall
Go
SET NOCOUNT ON
---------- retrieving with wildcard _ ----------
-- ********** Begin ********** --
SELECT prod_id, prod_name, prod_price
FROM Products
WHERE prod_name LIKE '1_ inch%'
-- ********** End ********** --
GO