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SQL Window Functions Guide
sql data analysis techniques
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Master SQL window functions: ROW_NUMBER, RANK, DENSE_RANK for ranking, LAG/LEAD for time-series analysis, FIRST_VALUE/LAST_VALUE for first/last in group, SUM/COUNT/AVG OVER for running totals, NTILE for percentile buckets, and complex examples combining multiple window functions in a single query for real business problems
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