SQL Server - primary key constraint modify

Question

Hi,
I have a table with many records. I wanted to modify the primary key constraint. The only way to alter the primary key constraint is to drop and create again. Please let me if it is right.
Can we create primary key constraint with NoCheck. Since we have lots of records in our table, creating primary key constraint takes more time because it is checking the existing data. Please provide your comments.
Thanks.

Answer 1

>>I have a table with many records. I wanted to modify the primary key constraint. The only way to alter the primary key constraint is to drop and create again. Please let me if it is right.
http://technet.microsoft.com/en-us/library/ms181043(v=sql.105).aspx
Note
To modify a PRIMARY KEY constraint, you must first delete the existing PRIMARY KEY constraint and then re-create it with the new definition.
>>Can we create primary key constraint with NoCheck. Since we have lots of records in our table, creating primary key constraint takes more time because it is checking the existing data. Please provide your comments.
http://msdn.microsoft.com/en-IN/library/ms188066.aspx
When FOREIGN KEY or CHECK constraints are added, all existing data is verified for constraint violations unless the WITH
NOCHECK option is specified. If any violations occur, ALTER TABLE fails and an error is returned. When a new PRIMARY KEY or UNIQUE constraint is added to an existing column, the data in the column or columns must be unique. If duplicate values are found, ALTER
TABLE fails. The WITH NOCHECK option has no effect when PRIMARY KEY or UNIQUE constraints are added.
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