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Add column with duplicate flag

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Execution time: 0,02 sec, rows selected: 9, rows affected: 9, absolute service time: 0,22 sec, absolute service time: 0,23 sec 
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   track_num runner_name dup
1 1 John 1
2 1 John 1
3 1 Jack NULL
4 2 Amy NULL
5 2 Mary NULL
6 2 John NULL
7 3 Josh 1
8 3 Josh 1
9 3 Taylor NULL