比较SQL Server约束和DML触发器

IF OBJECT_ID('SalesHistory')>0

DROP TABLE SalesHistory;

GO

CREATE TABLE [dbo].[SalesHistory]

(

[SaleID] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,

[Product] [varchar](10) NULL,

[SaleDate] [datetime] NULL,

[SalePrice] [money] NULL

)

GO DECLARE @i SMALLINT

SET @i = 1WHILE (@i <=100)

BEGIN

INSERT INTO SalesHistory(Product, SaleDate, SalePrice)

VALUES('Computer', DATEADD(mm, @i, '3/11/1919'), DATEPART(ms, GETDATE()) + (@i + 57))

INSERT INTO SalesHistory(Product, SaleDate, SalePrice)

VALUES('BigScreen', DATEADD(mm, @i, '3/11/1927'), DATEPART(ms, GETDATE()) + (@i + 13))

INSERT INTO SalesHistory(Product, SaleDate, SalePrice)

VALUES('PoolTable', DATEADD(mm, @i, '3/11/1908'), DATEPART(ms, GETDATE()) + (@i + 29))SET @i = @i + 1

END

GOINSERT INTO l_SalesProducts(Product)

SELECT 'BigScreen'

UNION

SELECT 'Computer'

UNION

SELECT 'PoolTable' 

ALTER TABLE SalesHistory

ADD CONSTRAINT fk_SalesHistory FOREIGN KEY (Product) REFERENCES

l_SalesProducts(Product)