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??一站式輕松地調用各大LLM模型接口，
支持GPT4、智譜、豆包、星火、月之暗面
及文生圖、文生視頻
廣告
**選擇性** 基數與總行數的比值再乘以 100%就是某個列的選擇性
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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哎呀哎呀视频在线观看
