The DB, if it is built with SQLite, will be so performant that it is great!

Please say more about the relationship between input and the desired output... 

DATE,HOUR,SITE,SALES,ITEMS,ITEMS2,ITEMS3,ITEMS4,ITEMS5,ITEMS6
11/02/2011,20,NAW6546,51.0,124.0,82.0,50.0,0.0,0.0,366.0
11/02/2011,21,NAW6546,72.0,300.0,82.0,50.0,0.0,0.0,214.0
11/02/2011,22,NAW6546,5.0,254.0,82.0,50.0,0.0,0.0,985.0
11/02/2011,23,NAW6546,47.0,530.0,82.0,50.0,0.0,0.0,517.0

[download]
So there is:
A) date (11/02/2011),
B) hour, like [ 20,20,21 ]
C) SITE NAW6546,
D) ITEMS 1..6
6 seconds is a ridiculously long time, and would do a linear search through 700 files with 300K+ lines.

In reply to Re: Best way to match a hash with large CSV file by Marshall
in thread Best way to match a hash with large CSV file by alphavax

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