set primary for nvarchar

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SQL-Server-2005

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Hi
I have "login" field in my Users table. login is of nvarchar(max) datatype.
I would like to set this field as Primary. but db is not allowing to set primary for nvarchar. How can I set Primary key for nvarchar fields?

Thanks and Regards

Posted 12-Apr-11 23:58pm

krishnaMurali

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jim lahey 13-Apr-11 6:03am

why do you want nvarchar as a primary?

2 solutions

Solution 2

Why would you need nvarchar(MAX) for "login"? That means you expect 2^31-1 bytes for the login.
Change datatype for "login" column to nvarchar(20) or something more realistic.

Posted 13-Apr-11 0:08am

Costica U

Updated 13-Apr-11 0:16am

v2

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Pong D. Panda · Accepted Answer · 2011-04-13T00:07:00

You cant mate.
(MAX) length wont be accepted as PK.

Use int instead and make your nvarchar(max) as index.
Using nvarchar as PK will make your searching really slow.

But if you still want to use nvarchar, declare the length. Something like this..

CREATE TABLE Login(
P_Id nvarchar(10) NOT NULL PRIMARY KEY,
password nvarchar(100) NOT NULL
)