sql server - SQL primary key - complex primary or string with concatenation? -

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I have a table with 16 columns. This will be the most used table in the web application and it will contain a few hundred toned lines. The database is built on SQL Server 2008.

What is the quickest option for my question primary key? I can use complex primary keys with two big companies or can I use a constructive value, but I have to add it later?

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