sum(vol_sales) OVER(ORDER BY month asc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS cum_vol_sales,

sum(vol_sales_usd) OVER(ORDER BY month asc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS cum_vol_sales_usd

from (select date_trunc('month', block_timestamp) as date, currency_symbol, sum(price) as vol_sales, sum(price_usd) as vol_sales_usd

from ethereum.core.ez_nft_sales

where event_type = 'sale'

group by 1,2) where currency_symbol='ETH' or currency_symbol='WETH'

order by 1 desc