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* prefer relative links from root * wip * split aggregate function reference * split system tables
77 lines
2.4 KiB
Markdown
77 lines
2.4 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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Calculates the moving sum of input values.
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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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The function can take the window size as a parameter. If left unspecified, the function takes the window size equal to the number of rows in the column.
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**Parameters**
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- `numbers_for_summing` — [Expression](../../../sql-reference/syntax.md#syntax-expressions) resulting in a numeric data type value.
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- `window_size` — Size of the calculation window.
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**Returned values**
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- Array of the same size and type as the input data.
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**Example**
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The sample table:
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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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The queries:
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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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