Go to your hardware store or French Polisher and get special crayons that are made for just that problem. Don't use the 'rub it with a shelled walnut' tip if it comes up, I've tried it and it's a myth!
You might try lightly sanding it if the scratch isn't deep and apply a matching oak stain over the entire table top. I worked out a sizeable scratch on an old cherry sewing machine cabinet and then restained over the drawer and you couldn't tell it was ever scratched and I used an electric sander. If you try this out, you will need a protective finish.
You can't really remove the scratch, but you can fill it in the so it will blend with the rest of the wood. Use a crayon which is a close match to the oak table top. Gently melt the crayon to soften it and apply over the scratch, then buff with a soft cloth.
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