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Worst example ever

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Execution time: 0,02 sec, rows selected: 7, rows affected: 7, absolute service time: 0,19 sec, absolute service time: 0,2 sec  
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   id pre aaa rownum groupid
1 1 0 1 1 1
2 1 1 0 2 1
3 1 1 0 3 1
4 2 0 1 4 2
5 2 1 0 5 2
6 2 3 1 6 3
7 2 1 0 7 3