SQL中的or與in的區別

SQL中的or與in的區別 or與in同樣的案例（條件裏只有a時）web a in (1,2,3) a = 1 or a = 2 or a = 3 or與in不同的案例（條件裏不止a時）sql where a in (1,3) and b = 2 等同於 where (a = 1 or a = 3) and b = 2 等同於 where a = 1 and b = 2 or a = 3 and

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