例题
![](https://img.haomeiwen.com/i9843094/aa675ab558335f9d.png)
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![](https://img.haomeiwen.com/i9843094/4e103fb38b02ab39.png)
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![](https://img.haomeiwen.com/i9843094/a9d59bfd4a0c4701.png)
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![](https://img.haomeiwen.com/i9843094/d2731d76eeb2caa8.png)
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![](https://img.haomeiwen.com/i9843094/e9fdc78be7f4622e.png)
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![](https://img.haomeiwen.com/i9843094/9e772b6d6d570e99.png)
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![](https://img.haomeiwen.com/i9843094/0e6e8c7da0ee1d5a.png)
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![](https://img.haomeiwen.com/i9843094/6c181ade8e0f4640.png)
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![](https://img.haomeiwen.com/i9843094/0b7dc6fba48a84ff.png)
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![](https://img.haomeiwen.com/i9843094/031dbf74ec7935ab.png)
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![](https://img.haomeiwen.com/i9843094/f3dfb85098817b1f.png)
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![](https://img.haomeiwen.com/i9843094/30a3d615353b916e.png)
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![](https://img.haomeiwen.com/i9843094/2e3336fafa073d6b.png)
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![](https://img.haomeiwen.com/i9843094/d18e3ff205f3c8c0.png)
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![](https://img.haomeiwen.com/i9843094/5f3bbd0931b87561.png)
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![](https://img.haomeiwen.com/i9843094/4d33af4a9df00bdd.png)
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![](https://img.haomeiwen.com/i9843094/8ffe386b6f1e6201.png)
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子查询多行的时候用in
22
![](https://img.haomeiwen.com/i9843094/e8014c3aa22167f7.png)
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![](https://img.haomeiwen.com/i9843094/2310dce390a50e21.png)
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![](https://img.haomeiwen.com/i9843094/8a514843c95b98b6.png)
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![](https://img.haomeiwen.com/i9843094/e8e088683ab0ded5.png)
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![](https://img.haomeiwen.com/i9843094/1c63107fec2b9e02.png)
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![](https://img.haomeiwen.com/i9843094/52ec22a0395a870f.png)
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![](https://img.haomeiwen.com/i9843094/8a1cf64e2db5fcf1.png)
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![](https://img.haomeiwen.com/i9843094/e9e4b0b6c0e9c6ba.png)
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![](https://img.haomeiwen.com/i9843094/9c93a605e43b4022.png)
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