Here the exactly example. I match the file A with the file B through the keys "l100107,bbbbbb,a_0100" so I decrement the $qtd from file A in this example 16 and 24 till 0. Notice that if you sum up this two values they are the $max of file B 40. There is no possibility that my process result different values from both files. I put the $tot in the result file to explain the flow. 
File A
l100107,bbbbbb,a_0100,loc,13,16
l100107,bbbbbb,a_0100,loc,14,24

File B
l100107,bbbbbb,a_0100,40

Result File
l100107,bbbbbb,loc,13,40,15
l100107,bbbbbb,loc,14,40,23
l100107,bbbbbb,loc,13,40,14
l100107,bbbbbb,loc,14,40,22
l100107,bbbbbb,loc,13,40,13
l100107,bbbbbb,loc,14,40,21
l100107,bbbbbb,loc,13,40,12
l100107,bbbbbb,loc,14,40,20
l100107,bbbbbb,loc,13,40,11
l100107,bbbbbb,loc,14,40,19
l100107,bbbbbb,loc,13,40,10
l100107,bbbbbb,loc,14,40,18
l100107,bbbbbb,loc,13,40,9
l100107,bbbbbb,loc,14,40,17
l100107,bbbbbb,loc,13,40,8
l100107,bbbbbb,loc,14,40,16
l100107,bbbbbb,loc,13,40,7
l100107,bbbbbb,loc,14,40,15
l100107,bbbbbb,loc,13,40,6
l100107,bbbbbb,loc,14,40,14
l100107,bbbbbb,loc,13,40,5
l100107,bbbbbb,loc,14,40,13
l100107,bbbbbb,loc,13,40,4
l100107,bbbbbb,loc,14,40,12
l100107,bbbbbb,loc,13,40,3
l100107,bbbbbb,loc,14,40,11
l100107,bbbbbb,loc,13,40,2
l100107,bbbbbb,loc,14,40,10
l100107,bbbbbb,loc,13,40,1
l100107,bbbbbb,loc,14,40,9
l100107,bbbbbb,loc,13,40,0
l100107,bbbbbb,loc,14,40,8
l100107,bbbbbb,loc,14,40,7
l100107,bbbbbb,loc,14,40,6
l100107,bbbbbb,loc,14,40,5
l100107,bbbbbb,loc,14,40,4
l100107,bbbbbb,loc,14,40,3
l100107,bbbbbb,loc,14,40,2
l100107,bbbbbb,loc,14,40,1
l100107,bbbbbb,loc,14,40,0

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In reply to Re^4: how to avoid full scan in file. by EBK
in thread how to avoid full scan in file. by EBK

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