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82 lines
2.5 KiB
Markdown
82 lines
2.5 KiB
Markdown
---
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toc_priority: 113
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---
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# groupArrayMovingSum {#agg_function-grouparraymovingsum}
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计算输入值的移动和。
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**语法**
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``` sql
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groupArrayMovingSum(numbers_for_summing)
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groupArrayMovingSum(window_size)(numbers_for_summing)
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```
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该函数可以将窗口大小作为参数。 如果未指定，则该函数的窗口大小等于列中的行数。
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**参数**
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- `numbers_for_summing` — [表达式](../../../sql-reference/syntax.md#syntax-expressions) 生成数值数据类型值。
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- `window_size` — 窗口大小。
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**返回值**
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- 与输入数据大小相同的数组。
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对于输入数据类型是[Decimal](../../../sql-reference/data-types/decimal.md) 数组元素类型是 `Decimal128` 。
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对于其他的数值类型, 获取其对应的 `NearestFieldType` 。
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**示例**
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样表:
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``` sql
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CREATE TABLE t
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(
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`int` UInt8,
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`float` Float32,
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`dec` Decimal32(2)
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)
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ENGINE = TinyLog
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```
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``` text
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┌─int─┬─float─┬──dec─┐
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│ 1 │ 1.1 │ 1.10 │
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│ 2 │ 2.2 │ 2.20 │
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│ 4 │ 4.4 │ 4.40 │
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│ 7 │ 7.77 │ 7.77 │
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└─────┴───────┴──────┘
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```
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查询:
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``` sql
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SELECT
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groupArrayMovingSum(int) AS I,
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groupArrayMovingSum(float) AS F,
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groupArrayMovingSum(dec) AS D
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FROM t
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```
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``` text
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┌─I──────────┬─F───────────────────────────────┬─D──────────────────────┐
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│ [1,3,7,14] │ [1.1,3.3000002,7.7000003,15.47] │ [1.10,3.30,7.70,15.47] │
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└────────────┴─────────────────────────────────┴────────────────────────┘
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```
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``` sql
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SELECT
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groupArrayMovingSum(2)(int) AS I,
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groupArrayMovingSum(2)(float) AS F,
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groupArrayMovingSum(2)(dec) AS D
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FROM t
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```
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``` text
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┌─I──────────┬─F───────────────────────────────┬─D──────────────────────┐
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│ [1,3,6,11] │ [1.1,3.3000002,6.6000004,12.17] │ [1.10,3.30,6.60,12.17] │
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└────────────┴─────────────────────────────────┴────────────────────────┘
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```
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