Creating composite primary key in SQL Server

Question

How to add composite primary keys in SQL Server 2008?

I have a table as follows.

testRequest (wardNo nchar(5)
            , BHTNo nchar(5)
                   


        

Answer 1

it simple, select columns want to insert primary key and click on Key icon on header and save table

happy coding..,

Answer 2

If you use management studio, simply select the wardNo, BHTNo, testID columns and click on the key mark in the toolbar.

Command for this is,

ALTER TABLE dbo.testRequest
ADD CONSTRAINT PK_TestRequest 
PRIMARY KEY (wardNo, BHTNo, TestID)

Answer 3

How about something like

CREATE TABLE testRequest (
        wardNo nchar(5),
        BHTNo nchar(5),
        testID nchar(5),
        reqDateTime datetime,
        PRIMARY KEY (wardNo, BHTNo, testID)
);

Have a look at this example

SQL Fiddle DEMO

Answer 4

How about this:

ALTER TABLE dbo.testRequest
ADD CONSTRAINT PK_TestRequest 
PRIMARY KEY (wardNo, BHTNo, TestID)