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Muhsinathk

Composite key in sql server

Replies: 5 | Posted by: Muhsinathk on 6/12/2012 | Category: Sql Server Forums | Views: 645 | Status: [Member] | Points: 10  
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I want to know more about composite key in sql server.
Is there any link?


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Muhsinathk
Muhsinathk  
Posted on: 6/12/2012 12:42:54 AM 		Level: Bronze | Status: [Member] | Points: 25

Composite key: One primary key Contains more then one
columns is called Composite key.

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CGN007
CGN007  
Posted on: 6/12/2012 1:02:10 AM 		Level: Silver | Status: [Member] | Points: 25

The key which uniquely identify the rows of the table and is formed by combining at least two or more columns is
called composite key.
More details with example http://weblogs.sqlteam.com/jeffs/archive/2007/08/23/composite_primary_keys.aspx

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CGN007
CGN007  
Posted on: 6/12/2012 1:06:07 AM 		Level: Silver | Status: [Member] | Points: 25

Syntax 
-- Sample Table

create table myTable 

(

    Column1 int not null,

    Column2 int not null

)

GO



-- Add Constraint

ALTER TABLE myTable

    ADD CONSTRAINT pk_myConstraint PRIMARY KEY (Column1,Column2)

GO

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Muhsinathk
Muhsinathk  
Posted on: 6/12/2012 1:11:02 AM 		Level: Bronze | Status: [Member] | Points: 25

Thank youu

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Sriramnandha
Sriramnandha  
Posted on: 6/21/2012 6:27:54 AM 		Level: Starter | Status: [Member] | Points: 25

Hi,

More Than one Primary Key is a Composite Key.

Create table Test(Testid int,TestidKey int add constraint pk_Test(Testid,TestidKey),TestName varchar(90))

Regards

Sriram.R



sriram

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