Excerpted from https://github.com/Snowflake-Labs/sfguide-financial-asset-management/blob/master/setup/finserv%20demo%2030%20DDL.sql

create-replace-finservam-position.sql

create or replace view finservam.prod.position (
    symbol, exchange, date, trader, pm, num_shares_cumulative, cash_cumulative, close,
    market_value, pnl comment 'Profit and Loss: Demonstrate comment on view column'
)
    comment = 'what assets owned; demo Window Function running sum'
as
with cte as (
    select t.symbol, exchange, t.date, trader, pm,
            sum(num_shares) over(
                partition by t.symbol, exchange, trader
                order by t.date rows unbounded preceding
            ) num_shares_cumulative,
            sum(cash) over(
                partition by t.symbol, exchange, trader
                order by t.date rows unbounded preceding
            ) cash_cumulative,
            s.close
        from finservam.prod.trade t
        inner join finservam.prod.stock_history s 
            on t.symbol = s.symbol and s.date = t.date
)
select *, num_shares_cumulative * close as market_value, 
        num_shares_cumulative * close + cash_cumulative as pnl
    from cte;