How to add composite primary keys in SQL Server 2008? I have a table

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Editorial Team

Asked: June 12, 20262026-06-12T02:30:39+00:00 2026-06-12T02:30:39+00:00

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?

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Editorial Team · Answer 1 · 2026-06-12T02:30:41+00:00

Editorial Team

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

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Command for this is,

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

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