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100 lines
1.8 KiB
Markdown
100 lines
1.8 KiB
Markdown
---
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toc_priority: 107
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---
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# avgWeighted {#avgweighted}
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Calculates the [weighted arithmetic mean](https://en.wikipedia.org/wiki/Weighted_arithmetic_mean).
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**Syntax**
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``` sql
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avgWeighted(x, weight)
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```
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**Arguments**
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- `x` — Values.
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- `weight` — Weights of the values.
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`x` and `weight` must both be
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[Integer](../../../sql-reference/data-types/int-uint.md),
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[floating-point](../../../sql-reference/data-types/float.md), or
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[Decimal](../../../sql-reference/data-types/decimal.md),
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but may have different types.
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**Returned value**
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- `NaN` if all the weights are equal to 0 or the supplied weights parameter is empty.
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- Weighted mean otherwise.
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**Return type** is always [Float64](../../../sql-reference/data-types/float.md).
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**Example**
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Query:
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``` sql
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SELECT avgWeighted(x, w)
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FROM values('x Int8, w Int8', (4, 1), (1, 0), (10, 2))
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```
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Result:
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``` text
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┌─avgWeighted(x, weight)─┐
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│ 8 │
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└────────────────────────┘
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```
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**Example**
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Query:
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``` sql
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SELECT avgWeighted(x, w)
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FROM values('x Int8, w Float64', (4, 1), (1, 0), (10, 2))
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```
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Result:
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``` text
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┌─avgWeighted(x, weight)─┐
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│ 8 │
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└────────────────────────┘
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```
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**Example**
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Query:
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``` sql
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SELECT avgWeighted(x, w)
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FROM values('x Int8, w Int8', (0, 0), (1, 0), (10, 0))
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```
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Result:
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``` text
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┌─avgWeighted(x, weight)─┐
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│ nan │
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└────────────────────────┘
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```
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**Example**
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Query:
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``` sql
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CREATE table test (t UInt8) ENGINE = Memory;
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SELECT avgWeighted(t) FROM test
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```
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Result:
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``` text
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┌─avgWeighted(x, weight)─┐
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│ nan │
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└────────────────────────┘
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```
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