ClickHouse/docs/zh/sql-reference/aggregate-functions/reference/grouparray.md
2021-03-25 17:09:19 +08:00

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# groupArray {#agg_function-grouparray}
**语法**
``` sql
groupArray(x)
groupArray(max_size)(x)
```
创建参数值的数组。
值可以按任何(不确定)顺序添加到数组中。
第二个版本(带有 `max_size` 参数)将结果数组的大小限制为 `max_size` 个元素。
例如, `groupArray (1) (x)` 相当于 `[any (x)]`
在某些情况下您仍然可以依赖执行顺序。这适用于SELECT(查询)来自使用了 `ORDER BY` 子查询的情况。