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May 23rd, 2018
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  1. Col1 col2
  2. x a
  3. x a
  4. x b
  5. x b
  6. y c
  7. y c
  8. y d
  9. y d
  10. z e
  11. z e
  12. z f
  13.  
  14. x a 2
  15. x b 2
  16. y c 2
  17. y d 2
  18.  
  19. table
  20. .GroupBy(x=>new{x.col1,x.clo2})
  21. .Select(x=>new{ x.key.col1,x.key.col2,x.Count(z=>z.col1)
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