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66 lines
965 B
Markdown
66 lines
965 B
Markdown
---
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slug: /en/sql-reference/aggregate-functions/reference/avg
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sidebar_position: 5
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---
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# avg
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Calculates the arithmetic mean.
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**Syntax**
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``` sql
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avg(x)
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```
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**Arguments**
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- `x` — input values, must be [Integer](../../../sql-reference/data-types/int-uint.md), [Float](../../../sql-reference/data-types/float.md), or [Decimal](../../../sql-reference/data-types/decimal.md).
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**Returned value**
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- The arithmetic mean, always as [Float64](../../../sql-reference/data-types/float.md).
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- `NaN` if the input parameter `x` is empty.
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**Example**
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Query:
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``` sql
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SELECT avg(x) FROM values('x Int8', 0, 1, 2, 3, 4, 5);
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```
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Result:
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``` text
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┌─avg(x)─┐
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│ 2.5 │
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└────────┘
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```
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**Example**
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Create a temp table:
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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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```
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Get the arithmetic mean:
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Query:
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```
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SELECT avg(t) FROM test;
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```
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Result:
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``` text
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┌─avg(x)─┐
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│ nan │
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└────────┘
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```
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