Group by and SUM

Hi everyone,

I want to group all the campaigns (there are 4) and add (total) the clicks and the amount (importe). I have this but it gives me an error.

SELECT Campaign, Clicks, CTR, "Importe"
FROM "AdWords (Google Analytics)"
JOIN Tratos
WHERE Fase = 'Propuesta Ganada'
group by Campaign

someone help me?

Thanks