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docs/en/sql-reference/20-sql-functions/07-aggregate-functions/aggregate-stddev-samp.md
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title: STDDEV_SAMP
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---
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-Aggregate function.
+Returns the sample standard deviation (the square root of VAR_SAMP()) of an expression.
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-The STDDEV_SAMP() function returns the sample standard deviation(the square root of VAR_SAMP()) of an expression.
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-
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-:::caution
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-NULL values are not counted.
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-:::
+- NULL values are ignored.
+- STDDEV_SAMP() returns `NULL` instead of `0` when there is only one input record.
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## Syntax
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## Return Type
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-double
+Double.
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## Example
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