Update recalculate_value_column.md

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noramullen1 2020-10-21 13:19:47 -07:00
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This example uses [NOAA water sample data](/influxdb/v2.0/reference/sample-data/#noaa-water-sample-data).
{{% /note %}}
Use [`map()`](/influxdb/v2.0/reference/flux/stdlib/built-in/transformations/map/) to recalculate the `_value` column without creating a new one. Use the `with` operator in the `map` function to overwrite the existing `_value` column.
Use [`map()`](/influxdb/v2.0/reference/flux/stdlib/built-in/transformations/map/) to recalculate the `_value` column without creating a new one. Use the `with` operator in [`map()`](/influxdb/v2.0/reference/flux/stdlib/built-in/transformations/map/) to overwrite the existing `_value` column.
The following example uses [`map()`](/influxdb/v2.0/reference/flux/stdlib/built-in/transformations/map/) to convert Fahrenheit temperature values into Celsius.