mysql利用子查询后的效率影响

仅仅是利用id:html explain SELECT * from customer where id in(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) 结果：post 利用了子查询：ui explain SELECT id,`name` FROM customer where id IN(select DISTINCT(custo

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