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I have a file with 8 gig data with three columns and many rows. Every column has an integer.

I tried to calculate numbers of rows with this property:

Ri.colm1=Rj.colm1&&Ri.colm2=Rj.colm2 && Ri.colm3<>Rj.colm3

Please help.

tnw
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mohammad
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    What have you tried? What specific problems are you running into? Adding some code will help us understand what you're asking, because right now it's not very clear. – Mage Xy Oct 21 '15 at 13:41
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    What is your question? How does this code relate to the problem you're trying to solve? What is the type of file you're working with? Can you give us some sample data? – tnw Oct 21 '15 at 13:46
  • May [this](http://stackoverflow.com/a/20043663/2037229) help – 54l3d Oct 21 '15 at 13:46

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