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linq subquery z grupowaniem po dwóch polach

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Compilation time: 0.45 sec, absolute running time: 0.36 sec, cpu time: 0.2 sec, average memory usage: 25 Mb, average nr of threads: 4 
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dane:
1 - A
   23% - 23(1)
2 - A
   12% - 46(2)
3 - A
   8% - 8(3)
4 - B
   23% - 23(4)
   8% - 16(4)
query:
23% - 46
12% - 46
8% - 24
query2:
A,23% - 23
A,12% - 46
A,8% - 8
B,23% - 23
B,8% - 16