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How do you compute percentiles, medians, and quantile buckets in SQL?

Means lie on skewed data like latency and spend, and SQL has dedicated functions for the truth. The signal is PERCENTILE_CONT/DISC for exact quantiles, NTILE for bucketing, and why p50/p99 beat the average.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Means lie on skewed data like latency and spend, and SQL has dedicated functions for the truth. The signal is PERCENTILE_CONT/DISC for exact quantiles, NTILE for bucketing, and why p50/p99 beat the average.

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