SQL实战演练之网上商城数据库商品类别数据操作

IF DB_ID('EshopDB') IS NOT NULL DROP DATABASE EshopDB
GO
CREATE DATABASE EshopDB
ON PRIMARY
(
	NAME=EshopDB,
	FILENAME='D:\xxxx\EshopDB.mdf',
	SIZE=10MB,
	MAXSIZE=30MB,
	FILEGROWTH=15%
)
LOG ON
(
	NAME=EshopDB_log,
	FILENAME='D:\xxxx\EshopDB_log.ldf',
	SIZE=5MB,
	MAXSIZE=20MB
)

CREATE TABLE EPType
(
	EPTID INT NOT NULL PRIMARY KEY,
	EPTName NVARCHAR(50) NOT NULL,
)

CREATE TABLE ECType
(
	ECTID INT NOT NULL PRIMARY KEY,
	EPTID INT NOT NULL,
	ECTName NVARCHAR(50) NOT NULL,
	FOREIGN KEY(EPTID) REFERENCES EPType(EPTID)
)

INSERT INTO EPType VALUES(1,'上衣'),(2,'帽子'),(3,'童装')
INSERT INTO ECType VALUES(1,1,'衬衣'),(2,1,'运动装'),(3,1,'外套'),(4,2,'保暖帽'),(5,2,'运动帽'),(6,3,'男童'),(7,3,'女童')

CREATE VIEW  HAT
AS 
SELECT EPType.EPTName,ECType.ECTName 
FROM EPType,ECType 
WHERE ECType.EPTID=(SELECT EPTID FROM EPType WHERE EPType.EPTName='帽子') AND EPType.EPTName='帽子'
GO
SELECT * FROM HAT

INSERT INTO EPType VALUES(4,'鞋')
INSERT INTO ECType VALUES(8,4,'女皮鞋'),(9,4,'男运动鞋'),(10,4,'童鞋')

SELECT COUNT(*) FROM ECType