What is the Best and Fastest Way to Flatten Data?

Given the following data set, what’s the best and fastest way to flatten them? This can be achieved with LINQ, SQL, C#, or whatever else you prefer.

001 12/5/2013 113 143 11143 44 673
001 12/6/2013 113 143 11143 44 673
001 12/7/2013 113 143 11143 44 673
001 12/8/2013 113 143 11143 44 673
001 12/9/2013 113 143 11143 44 673
001 12/10/2013 113 143 11143 44 673
002 12/5/2013 113 143 11143 44 673
002 12/6/2013 113 143 11143 44 673
002 12/7/2013 113 143 11143 44 673
002 12/8/2013 113 143 11143 44 673
002 12/9/2013 113 143 11143 44 673
002 12/10/2013 113 143 11143 44 673

Desired result:

001 12/5/2013 113 143 11143 44 673 12/6/2013 113 143 11143 44 673 12/7/2013 113 143 11143 44 673 12/8/2013 113 143 11143 44 673 12/9/2013 113 143 11143 44 673 12/10/2013 113 143 11143 44 673
002 12/5/2013 113 143 11143 44 673 12/6/2013 113 143 11143 44 673 12/7/2013 113 143 11143 44 673 12/8/2013 113 143 11143 44 673 12/9/2013 113 143 11143 44 673 12/10/2013 113 143 11143 44 673

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