分组后还需要去重怎么办 select count(distinct pid) from a group by id; 返回
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分组后还需要去重怎么办 select count(distinct pid) from a group by id;
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fate stay night VIP0
2019/1/14.select(“count(distinct))”)
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fate stay night VIP0
2019/1/14select <int>
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