You can filter Products – to export only those, which contain fragments of SKU.
To filter by several fragments, split them by comma.
In this example, if you have the filter set to “SKU-1, AAA”, then it will export only those Shopify Products, where any part of their SKU contains “SKU-1” or “AAA”.
To export all Products, where SKU is empty – set the filter by SKU, and leave the search box empty.
You can apply the filter when exporting to any format, including Excel, Google Shopping Data Feed, Amazon.