Each declarative integrity constraint can be removed using the DROP clause of the ALTER TABLE statement. : ALTER TABLE « Table « SQL Server / T-SQL Tutorial

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

3. 2. 13. Each declarative integrity constraint can be removed using the DROP clause of the ALTER TABLE statement.


5> CREATE TABLE sales

6>         (order_no INTEGER NOT NULL PRIMARY KEY,

7>         order_date DATETIME NOT NULL,

8>         ship_date DATETIME NOT NULL)

9> GO

1>

2> ALTER TABLE sales

3>         ADD CONSTRAINT order_check CHECK(order_date <= ship_date)

4> GO

1>

2>

3> ALTER TABLE sales

4>       DROP CONSTRAINT order_check

5> GO

1>

2> drop table sales;

3> GO

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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