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

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## array_position

### description

#### Syntax

`BIGINT array_position(ARRAY<T> arr, T value)`

返回`value`在数组中第一次出现的位置/索引。

```
position - value在array中的位置（从1开始计算）；
0        - 如果value在array中不存在；
NULL     - 如果数组为NULL，或者value为NULL。
```

### notice

`仅支持向量化引擎中使用`

### example

```
mysql> set enable_vectorized_engine=true;

mysql> SELECT id,c_array,array_position(c_array, 5) FROM `array_test`;
+------+-----------------+------------------------------+
| id   | c_array         | array_position(`c_array`, 5) |
+------+-----------------+------------------------------+
|    1 | [1, 2, 3, 4, 5] |                            5 |
|    2 | [6, 7, 8]       |                            0 |
|    3 | []              |                            0 |
|    4 | NULL            |                         NULL |
+------+-----------------+------------------------------+
```

### keywords

ARRAY_POSITION