# count函数如何进行聚合
使用count函数进行聚合的正确用法如下：
```
SELECT
  http_method,
  count(http_method)
FROM
  apigateway
WHERE
  service_id = 'ecs' Group BY http_method
```
或者
```
SELECT
  http_method
FROM
  apigateway
WHERE
  service_id = 'ecs' DISTRIBUTE BY http_method
```
错误用法：将会报错。
```
SELECT
  http_method,
  count(http_method)
FROM
  apigateway
WHERE
  service_id = 'ecs' DISTRIBUTE BY http_method
```