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@ -555,13 +555,13 @@ SELECT column_name(s) FROM table2;
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| -------------------- | ---------------------- |
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| `LEFT()`、`RIGHT()` | 左边或者右边的字符 |
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| `LOWER()`、`UPPER()` | 转换为小写或者大写 |
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| `LTRIM()`、`RTIM()` | 去除左边或者右边的空格 |
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| `LTRIM()`、`RTRIM()` | 去除左边或者右边的空格 |
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| `LENGTH()` | 长度 |
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| `SOUNDEX()` | 转换为语音值 |
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其中, **`SOUNDEX()`** 可以将一个字符串转换为描述其语音表示的字母数字模式。
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```scss
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```sql
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SELECT *
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FROM mytable
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WHERE SOUNDEX(col1) = SOUNDEX('apple')
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