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.
Последние новости，这一点在新收录的资料中也有详细论述
This will suffice for discussion, and so long as it is understood。新收录的资料对此有专业解读
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