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Inventory update .dat to csv file

I have a csv file that has a list of books that I offer on my website. There are quantity, date available, and weight columns in this file that I would like updated using a file provided by my book distributor. The data file provided by my distributor is a fixed width .dat file that is around 500-600mb (I can provide position and width of the colum data). This file has over 2million books. I only need information on the 7000 or so books I offer on my site. The common field on both files is the UPC or ISBN Code.

What I need is a fast, easy and efficient way to update this data. It can be done in any manner offline or online that you suggest, but has to result in a tab delimited file and I have to be able to update it myself weekly.

Taidot: tietojenkäsittely, PHP, Ostoskärryt

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Tietoa työnantajasta:
( 28 arvostelua ) Westminster, United States

Projektin tunnus: #317187

11 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön

VALUEONWEB

I am ready to start, Please provide project details

$100 USD 2 päivässä
(215 arvostelua)
7.9
consus

Hello Sir my solution is bit different Please check PMB for bid detail Thanks

$150 USD 5 päivässä
(54 arvostelua)
7.8
garvs

Please look PM from me.

$40 USD 3 päivässä
(48 arvostelua)
5.2
ExactSystems

Please see detail on PMB. regards

$125 USD 2 päivässä
(3 arvostelua)
3.8
aze

hi, I have recently worked with books xml parsing for a book store site. please see my latest won projects. they recieves onix-xml from his publisher and need to fetch the information i.e isbn title, price availabilit Lisää

$80 USD 1 päivässä
(3 arvostelua)
3.7
ubud

Let's discuss it further through PM ^-^

$70 USD 3 päivässä
(2 arvostelua)
3.3
mohanlg

Hi, Ready to start now. Please check PMB. Thanks Sunny

$70 USD 1 päivässä
(5 arvostelua)
3.4
Mastersan

Hello, I will complete your task in one day after receiving all files, include layout (position, names and length for fixed file is required). Also, I'll match both files and maybe will ask you some questions about ma Lisää

$30 USD 1 päivässä
(2 arvostelua)
1.0
CPU

Hello. I need file samples to do it. Also tell me if there is programming language matter for you ? I can do it using python for example.

$30 USD 2 päivässä
(0 arvostelua)
0.0
eBizTech

Hi, please see the PM, thanks

$40 USD 1 päivässä
(0 arvostelua)
0.0
loyalbd

Please provide me sample data. I will feedback. regards..

$85 USD 7 päivässä
(0 arvostelua)
0.0