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

Means mislead on skewed data like latency and spend, and SQL ships 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 Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.

Means mislead on skewed data like latency and spend, and SQL ships 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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