Use ALTER TABLE statement to define the foreign key of a table. : ALTER TABLE « Table « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table » ALTER TABLE

3.2.12.Use ALTER TABLE statement to define the foreign key of a table.

4> CREATE TABLE salesman(

5>         no INT NOT NULL UNIQUE,

6>         fname CHAR(20) NOT NULL,

7>         lname CHAR(20) NOT NULL,

8>         product_no CHAR(10))

9> GO

1> CREATE TABLE product(

2>         product_no CHAR(10) NOT NULL UNIQUE,

3>         product_name CHAR(20) NULL,

4>         price MONEY NULL)

5> GO

1> ALTER TABLE product

2>         ADD CONSTRAINT prim_prod PRIMARY KEY(product_no)

3> GO

1>

2>

3> ALTER TABLE salesman

4>         ADD CONSTRAINT prim_sales PRIMARY KEY (no),

5>         CONSTRAINT foreign_sales FOREIGN KEY(product_no)

6>         REFERENCES product

7> GO

1>

2> drop table salesman;

3> GO

1> drop table product;

2> GO

1>

3.2.ALTER TABLE
	3.2.1.	The basic syntax of the ALTER TABLE statement
	3.2.2.	drop column syntax
	3.2.3.	Change the length of the emp_name column in the employee table from varchar(30) to varchar(50)
	3.2.4.	Alter table to add a constraint based on IN function
	3.2.5.	Altering a Table: A Basic Form
	3.2.6.	Alter table to add column
	3.2.7.	Alter table to drop a column
	3.2.8.	The DROP COLUMN clause provides the ability to drop an existing column of the table.
	3.2.9.	ALTER data size for a COLUMN
	3.2.10.	Altering a Table: Enhanced Form
	3.2.11.	Use ALTER TABLE statement to define the primary key
	3.2.12.	Use ALTER TABLE statement to define the foreign key of a table.
	3.2.13.	Each declarative integrity constraint can be removed using the DROP clause of the ALTER TABLE statement.
	3.2.14.	Expanded nvarchar(20) to nvarchar(300)
	3.2.15.	Creating a Computed Column in alter table command
	3.2.16.	Create a Table Index

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