WITH monthly AS (
SELECT
DATE_TRUNC('month', o.order_date) AS month,
SUM(oi.quantity * oi.unit_price) AS revenue
FROM shop_data.orders o
JOIN shop_data.order_items oi ON oi.order_id = o.order_id
WHERE o.status = 'delivered'
GROUP BY 1
)
SELECT
month,
revenue,
LAG(revenue) OVER (ORDER BY month) AS prev_month,
ROUND(
100.0 * (revenue - LAG(revenue) OVER (ORDER BY month))
/ NULLIF(LAG(revenue) OVER (ORDER BY month), 0),
1
) AS growth_pct
FROM monthly
ORDER BY month;WITH monthly AS (
SELECT
DATE_TRUNC('month', o.order_date) AS month,
SUM(oi.quantity * oi.unit_price) AS revenue
FROM shop_data.orders o
JOIN shop_data.order_items oi ON oi.order_id = o.order_id
WHERE o.status = 'delivered'
GROUP BY 1
)
SELECT
month,
revenue,
LAG(revenue) OVER (ORDER BY month) AS prev_month,
ROUND(
100.0 * (revenue - LAG(revenue) OVER (ORDER BY month))
/ NULLIF(LAG(revenue) OVER (ORDER BY month), 0),
1
) AS growth_pct
FROM monthly
ORDER BY month;WITH product_revenue AS (
SELECT
p.name,
SUM(oi.quantity * oi.unit_price) AS revenue
FROM shop_data.order_items oi
JOIN shop_data.products p ON p.product_id = oi.product_id
GROUP BY p.name
),
ranked AS (
SELECT
name,
revenue,
SUM(revenue) OVER () AS total,
SUM(revenue) OVER (ORDER BY revenue DESC) AS cumulative,
ROUND(
100.0 * SUM(revenue) OVER (ORDER BY revenue DESC)
/ SUM(revenue) OVER (),
1
) AS cumulative_pct
FROM product_revenue
)
SELECT name, revenue, cumulative_pct,
CASE
WHEN cumulative_pct <= 80 THEN 'A'
WHEN cumulative_pct <= 95 THEN 'B'
ELSE 'C'
END AS abc_class
FROM ranked
ORDER BY revenue DESC;WITH product_revenue AS (
SELECT
p.name,
SUM(oi.quantity * oi.unit_price) AS revenue
FROM shop_data.order_items oi
JOIN shop_data.products p ON p.product_id = oi.product_id
GROUP BY p.name
),
ranked AS (
SELECT
name,
revenue,
SUM(revenue) OVER () AS total,
SUM(revenue) OVER (ORDER BY revenue DESC) AS cumulative,
ROUND(
100.0 * SUM(revenue) OVER (ORDER BY revenue DESC)
/ SUM(revenue) OVER (),
1
) AS cumulative_pct
FROM product_revenue
)
SELECT name, revenue, cumulative_pct,
CASE
WHEN cumulative_pct <= 80 THEN 'A'
WHEN cumulative_pct <= 95 THEN 'B'
ELSE 'C'
END AS abc_class
FROM ranked
ORDER BY revenue DESC;