Primary key

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SQL-Server-2005

SQL-Server

Can i declare a column as a primary key after creating the table? Can u send me the syntax for that

Posted 27-Sep-10 20:50pm

Rohan Garuda

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Om Prakash Pant · Answer 1 · 2010-09-27T20:54:00

Solution 1

yes you can..

SQL

Create table testTable (userID int not null, userName varchar(20))
--now if you want to make UserID as primary key, then
alter table testTable add constraint pk_userID primary key (userID)

Posted 27-Sep-10 20:54pm

Om Prakash Pant

Updated 27-Sep-10 20:55pm

v2

Comments

Sandeep Mewara 28-Sep-10 15:27pm

Well, you should have also added to your answer that this conversion can fail if the values in specified column are not unique.
So, its a Yes & a No.

Om Prakash Pant 29-Sep-10 1:14am

It is not about column is unique or not. you cannot convert any data to any format. see this link on what you can convert and to which datatypes..

http://msdn.microsoft.com/en-us/library/ms187928.aspx