The correlation statistic tells the planner how closely the physical row order matches the column's sort order. A value near 1.0 means sequential access patterns - making index scan cheaper because the next row is likely on the same or adjacent page. For time-series data like created_at where rows are inserted chronologically, correlation is typically very high.
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2025年，全国政协委员海尼扎提·托呼提在新疆乌鲁木齐市偶然遇到一位外卖骑手，那天，对方蹲在路边吃饭，身旁放着半个没吃完的馕和一瓶水。
«Это станет катастрофой». Как США хотят взять под контроль Ормузский пролив и может ли Иран этому помешать?12 марта 2026。业内人士推荐新闻作为进阶阅读