Creating composite primary key in SQL Server

问题

How to add composite primary keys in SQL Server 2008?

I have a table as follows.

testRequest (wardNo nchar(5)
            , BHTNo nchar(5)
            , testID nchar(5)
            , reqDateTime datetime);

I need wardNo, BHTNo and testID to be a composite primary key.

How can I do this in SQL Server Management Studio?

回答1:

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)

回答2:

How about this:

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

回答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

回答4:

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

happy coding..,

来源：https://stackoverflow.com/questions/12594791/creating-composite-primary-key-in-sql-server