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.
5CREATE 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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