mysql in 查询效率慢优化

mysql> select * from abc_number_prop where number_id in (select number_id from abc_number_phone where phone = '82306839');mysql 为了节省篇幅，省略了输出内容，下同。sql 67 rows in set (12.00 sec)网络 只有67行数据返回，却花了12秒，而系统中

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