To update a product's SKU, you need to use the following columns:
-
ID or Handle
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Variant ID
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Variant SKU
If you want to ensure that only the SKU is updated without affecting other product information, you can use the MERGE command, which is the default if the Command column is left blank.
Here's an example of how your import file should look:
ID,Handle,Variant ID,Variant SKU,Command
1234567890,product-handle,9876543210,NEW-SKU,MERGE