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[1.1 基數（CARDINALITY)](1.1%E5%9F%BA%E6%95%B0%EF%BC%88CARDINALITY.md) [1.2 選擇性（SELECTIVITY)](1.2%E9%80%89%E6%8B%A9%E6%80%A7%EF%BC%88SELECTIVITY.md)
第 1 章 SQL 優化必懂概念
1.1 基數（CARDINALITY)
1.2 選擇性（SELECTIVITY)
附錄
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