一对多是正常的:
![](https://img.haomeiwen.com/i13807623/c2c8f61713ec38e7.png)
![](https://img.haomeiwen.com/i13807623/81d3ef191bece9e3.png)
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多对一是不正常的
![](https://img.haomeiwen.com/i13807623/927864bca2ac4183.png)
![](https://img.haomeiwen.com/i13807623/40593d3d81a4f2a2.png)
==========================================
多对多会隐去空白
![](https://img.haomeiwen.com/i13807623/122b64d9d14870d4.png)
![](https://img.haomeiwen.com/i13807623/a2358337478b7bed.png)
一对多是正常的:
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多对一是不正常的
==========================================
多对多会隐去空白
本文标题:空白在多对一和一对多的双向关系的副作用
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