Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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SELECT payment_month, monthly_amount,
LEAD(monthly_amount) OVER (ORDER BY payment_month) AS next_monthly_amount
FROM (
SELECT DATE_FORMAT(payment_date, "%Y-%M") AS payment_month,
SUM(amount) AS monthly_amount
FROM payment
WHERE YEAR(payment_date) = 2005
GROUP BY DATE_FORMAT(payment_date, "%Y-%M")
) AS subquery
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