wily grouping, Sql Server

wily grouping

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Execution time: 0,01 sec, rows selected: 8, rows affected: 6, absolute service time: 0,17 sec

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id
group_col
need_max
need_value

1
1
1
1
1

2
2
1
7
2

3
3
1
3
3

4
4
2
1
3

5
5
2
8
2

6
6
2
3
1


  
group_col
need_max

1
1
7

2
2
8

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