Grouping records and getting standard deviation intervals for grouped records in BigQuery, getting wrong value

Question

I have a SQL below which is able to get the interval average of timestamp column grouped by icao_address, flight_number, flight_date. I\'m trying to do the same for standard

Answer 1

You can use STDDEV_POP(<FLOAT>) to calculate the standard deviation as you can see here

Description

Returns the population (biased) standard deviation of the values. The return result is between 0 and +Inf.

This function ignores any NULL inputs. If all inputs are ignored, this function returns NULL.

If this function receives a single non-NULL input, it returns 0.

Supported Input Types

FLOAT64

Optional Clauses

The clauses are applied in the following order:

OVER: Specifies a window. See Analytic Functions. This clause is currently incompatible with all other clauses within STDDEV_POP(). DISTINCT: Each distinct value of expression is aggregated only once into the result.

Return Data Type

FLOAT64

I hope it helps