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SQL One-Liner: Running Total (Cumulative Sum)
One of the most common SQL interview challenges is calculating a running total (cumulative sum). Long Way (Subquery / Self-Join): Uses a subquery per row to compute the total up to that date. Correct but slow for large datasets. Shortcut One-Liner (Window Function): Uses SUM() OVER (ORDER BY column) to calculate running totals in a single scan ...
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