MySQL-Help Importing data into tables and ignoring existing data

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http://ubuntuforums.org – I'm new to MySQL and I have a question about importing data from csv files. I've spent the better part of today googling, trying new solutions, then dropping the table and starting over when a potential solution didn't work. I have a table, with two columns set as the primary key, and 12 subsequent columns where the data will live for each month. I get a csv file each month and I want to import the data into this table. The csv file has three columns, the two primary keys, and the sales figure for that month. I can import one month without issue, but then when I import the subsequent month, (Hardware)