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functions-and-operators: enrich instructions for string functions CHAR_LENGTH() and CHARACTER_LENGTH #15483 #16517

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functions-and-operators: enrich instructions for string functions CHAR_LENGTH() and CHARACTER_LENGTH #15483 #16517

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31 changes: 29 additions & 2 deletions functions-and-operators/string-functions.md
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Expand Up @@ -92,11 +92,38 @@ SELECT BIN(-7);

### [`CHAR_LENGTH()`](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_char-length)

返回字符串的字符长度
`CHAR_LENGTH()` 函数用于获取输入参数中字符的总数。

示例：

```sql
SELECT CHAR_LENGTH("TiDB") AS LengthOfString;

+----------------+
| LengthOfString |
+----------------+
| 4 |
+----------------+
```

```sql
SELECT CustomerName, CHAR_LENGTH(CustomerName) AS LenghtOfName FROM Customers;

+--------------------+--------------+
| CustomerName | LenghtOfName |
+--------------------+--------------+
| Albert Einstein | 15 |
| Robert Oppenheimer | 18 |
+--------------------+--------------+
```

> **注意：**
>
> 上面这个示例假设数据库中存在一个名为 `Customers` 的表，表中有一个名为 `CustomerName` 的列。

### [`CHARACTER_LENGTH()`](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_character-length)

与 `CHAR_LENGTH()` 功能相同
`CHARACTER_LENGTH()` 函数与 `CHAR_LENGTH()` 函数作用相同，返回结果相同，可以互换使用。
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### [`CONCAT()`](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat)

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