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48 lines
984 B
Markdown
48 lines
984 B
Markdown
---
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slug: /en/sql-reference/functions/time-series-functions
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sidebar_position: 172
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sidebar_label: Time Series
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---
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# Time Series Functions
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Below functions are used for time series analysis.
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## seriesPeriodDetectFFT
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Finds the period of the given time series data using FFT
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Detect Period in time series data using FFT.
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FFT - Fast Fourier transform (https://en.wikipedia.org/wiki/Fast_Fourier_transform)
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**Syntax**
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``` sql
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seriesPeriodDetectFFT(series);
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```
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**Arguments**
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- `series` - An array of numeric values
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**Returned value**
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- A real value equal to the period of time series
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Type: [Float64](../../sql-reference/data-types/float.md).
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**Examples**
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Query:
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``` sql
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SELECT seriesPeriodDetectFFT([1, 4, 6, 1, 4, 6, 1, 4, 6, 1, 4, 6, 1, 4, 6, 1, 4, 6, 1, 4, 6]) AS print_0;
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```
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Result:
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``` text
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┌───────────print_0──────┐
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│ 3 │
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└────────────────────────┘
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```
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