Files
Data_engineer_test_task/sql/daily_revenue.sql
T

17 lines
589 B
SQL

WITH RECURSIVE calendar(day, last_day) AS (
SELECT MIN(order_date), MAX(order_date) FROM daily_category_revenue
HAVING COUNT(*) > 0
UNION ALL
SELECT date(day, '+1 day'), last_day FROM calendar WHERE day < last_day
),
daily AS (
SELECT day AS order_date, COALESCE(SUM(r.revenue_kopecks), 0) AS revenue_kopecks
FROM calendar
LEFT JOIN daily_category_revenue AS r ON r.order_date = day
GROUP BY day
)
SELECT order_date, revenue_kopecks,
revenue_kopecks - LAG(revenue_kopecks) OVER (ORDER BY order_date) AS change_kopecks
FROM daily
ORDER BY order_date;