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                ``` 報錯 怎么解決? select a.username, a.age, b.age from user1 a left join user2 b on a.username = b.username union all select b.username, b.age, a.age from user1 a right join user2 b on a.username = b.username ``` ![](https://box.kancloud.cn/ce2f2563a012474706fd89c7619e8734_1160x372.png)
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