---
{
    "title": "length",
    "language": "zh-CN"
}
---

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# length
## description
### Syntax

`INT length(VARCHAR str)`


返回字符串的字节。

## example

```
mysql> select length("abc");
+---------------+
| length('abc') |
+---------------+
|             3 |
+---------------+

mysql> select length("中国");
+------------------+
| length('中国')   |
+------------------+
|                6 |
+------------------+
```
## keyword
LENGTH