问题我有3个表:人员、电话和电子邮件。每个人都有一个唯一ID，每个人可以有多个号码或多个电子邮件。简化后看起来像这样:+---------+----------+|ID|Name|+---------+----------+|5000003|Amy||5000004|George||5000005|John||5000008|Steven||8000009|Ashley|+---------+----------++---------+-----------------+|ID|Number|+---------+-----------------+|5000005|5551234||