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update PR list and zh-tw content

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Gang Yin 2023-02-16 21:37:50 +08:00
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README.md
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@ -151,6 +151,7 @@
| ISSUE & Pull Requests | USER | Title |
| ----------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
| [282](https://github.com/Vonng/ddia/pull/282) | [@WAangzE](https://github.com/WAangzE) | ch2: 更正一处公式问题 |
| [281](https://github.com/Vonng/ddia/pull/281) | [@lyuxi99](https://github.com/lyuxi99) | 更正多处内部链接错误 |
| [280](https://github.com/Vonng/ddia/pull/280) | [@lyuxi99](https://github.com/lyuxi99) | ch9: 更正内部链接错误 |
| [278](https://github.com/Vonng/ddia/pull/278) | [@LJlkdskdjflsa](https://github.com/LJlkdskdjflsa) | 发现了繁体中文版本中的错误翻译 |

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zh-tw/README.md
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@ -151,6 +151,7 @@
| ISSUE & Pull Requests | USER | Title |
| ----------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
| [282](https://github.com/Vonng/ddia/pull/282) | [@WAangzE](https://github.com/WAangzE) | ch2: 更正一處公式問題 |
| [281](https://github.com/Vonng/ddia/pull/281) | [@lyuxi99](https://github.com/lyuxi99) | 更正多處內部連結錯誤 |
| [280](https://github.com/Vonng/ddia/pull/280) | [@lyuxi99](https://github.com/lyuxi99) | ch9: 更正內部連結錯誤 |
| [278](https://github.com/Vonng/ddia/pull/278) | [@LJlkdskdjflsa](https://github.com/LJlkdskdjflsa) | 發現了繁體中文版本中的錯誤翻譯 |

8
zh-tw/ch2.md
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@ -315,11 +315,13 @@ function getSharks() {
}
```
在關係代數中：
而在關係代數中，你可以這樣寫：
$$
sharks = σ_{family = "sharks"}(animals)
sharks = \sigma_{family = "sharks"}(animals)
$$
σ（希臘字母西格瑪）是選擇運算子，只返回符合條件的動物，`family="shark"`。
其中 $\sigma$（希臘字母西格瑪）是選擇運算子，只返回符合 `family="shark"` 條件的動物。
定義 SQL 時，它緊密地遵循關係代數的結構：