select contract_address, project_name, sum(iff(price is null, 0, price)) as opensea_volume
from ethereum.nft_events
where block_timestamp >= '2022-01-01' and event_platform = 'opensea' and event_type = 'sale' and PROJECT_NAME is not null and project_name != 'opensea'
group by 1,2
order by 3 desc
limit 5