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mysql 如图所示，现有表a，表b，需求为 通过projectcode关联a、b表，查出address不同的 idcardnum。
2022-07-28 01:21:00 【CSDN问答】
mysql 如图所示，现有表a，表b，需求为 通过projectcode关联a、b表，查出address不同的 idcardnum。
补充下 是查出不同的 不是去重 我看下面有个 写的去重
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