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You can alter your table and if you now your columns is only running a query like<br />
<br />

<pre><code id="code-20-40515063-1">ALTER TABLE dbo.Your_Table
ADD CONSTRAINT PK_Your_Table 
PRIMARY KEY (COL1, COL2) </code></pre>
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You can alter your table and if you now your columns is only running a query like



ALTER TABLE dbo.Your_Table
ADD CONSTRAINT PK_Your_Table 
PRIMARY KEY (COL1, COL2) 

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<div class="content wysiwyg-content">
Hi<br />
<br />
What VB.net code would I use to add a composite primary key &nbsp;to an existing SQL table, which <br />
includes three of the columns<br />
<br />
Thanks
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Hi

What VB.net code would I use to add a composite primary key  to an existing SQL table, which 
includes three of the columns

Thanks

VB.net SQL set three columns as the primary key in am existing table

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.