I get this error when attempting to edit and save a few of my Magento products via admin: "The value of attribute "SKU" must be unique."
When I view my products in Magento admin a duplicate sku is nowhere to be found, but when I run a product export there are in fact some products with the same sku. In theory Magento should never have allowed this to happen, but alas, I'm dealing with a fairly large and mature (3+ year old) group of products that seems to carry the remnants of previous Magento bugs and quirks.
I'm guessing the only way to fix this issue is to manually remove one of the duplicate skus from the database, but I'm not sure of the best/safest way to do this. I have pretty much 0 experience working with databases, so any help is appreciated.