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CREATE TABLE TEST (month date, sales_value float); INSERT INTO TEST VALUES ('2025-01-31', 100) ,('2025-02-28', 110) ,('2025-03-31', 120) ,('2025-04-30', 130) ,('2025-05-31', 90); SELECT month, sales_value, LAG(sales_value) OVER (ORDER BY month) AS previous_month_value, sales_value - LAG(sales_value) OVER (ORDER BY month) AS difference FROM sales_data;

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