Просечно трошење во последните 3 дена за цел систем

Просечно дневно трошење за последните три дена, земајќи ги предвид сите трансакции:

SELECT 
    AVG(daily_spending) AS average_spending_last_3_days
FROM (
    SELECT 
        t.date::date AS transaction_date, 
        SUM(tb.spent_amount) AS daily_spending
    FROM 
        transaction t
    JOIN 
        transaction_breakdown tb ON t.transaction_id = tb.transaction_id
    WHERE 
        t.date >= CURRENT_DATE - INTERVAL '2 DAY'
        AND t.date < CURRENT_DATE + INTERVAL '1 DAY'
    GROUP BY 
        t.date::date
) daily_totals;