SQL中的or与in的区别

SQL中的or与in的区别 or与in同样的案例（条件里只有a时）web a in (1,2,3) a = 1 or a = 2 or a = 3 or与in不同的案例（条件里不止a时）sql where a in (1,3) and b = 2 等同于 where (a = 1 or a = 3) and b = 2 等同于 where a = 1 and b = 2 or a = 3 and

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