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| CUME_DIST() | Returns the cumulative distribution of a value within a group of values |
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| DENSE_RANK() | Returns a rank for each row without gaps in the numbering |
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| NTILE() | Distributes the rows in an ordered partition into the specified number of groups |
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| PERCENT_RANK() | Returns the percentage rank of the current row within its partition |
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| RANK() | Returns the rank of the current row in its partition, allowing gaps between ranks |
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| ROW_NUMBER() | Returns the position of the current row in its partition |
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### Selector functions
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Selector functions are unique to InfluxDB. They behave like aggregate functions in that they take a row of data and compute it down to a single value. However, selectors are unique in that they return a **time value** in addition to the computed value. In short, selectors return an aggregated value along with a timestamp.
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