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Greatest_N_Per_Group

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Execution time: 0,02 sec, rows selected: 4, rows affected: 13, absolute service time: 0,17 sec  
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   Power CitizenID ParentID
1 4,8000 40 309
2 5,4000 40 322
3 1,4000 172 309
4 1,0200 172 322