Updating SKU's from a CSV in Magento - Integrity constraint violation: 1062 error?

The best would be to use the API to do this kind of stuf.

There's not enough information in your post to accurately track this down. When you save product information in Magento there's multiple tables whose information will need to be updated. One of these tables has a four column unique key that, for some reason, your system is trying to update with information that would cause the four columns in that key to be a duplicate of another row.

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