[Home](./index.md) > [@datashaper/schema](./schema.md) > [FieldAggregateOperation](./schema.fieldaggregateoperation.md) ## FieldAggregateOperation enum This is the subset of aggregate functions that can operate on a single field so we don't accommodate additional args. See https://uwdata.github.io/arquero/api/op\#aggregate-functions Signature: ```typescript export declare enum FieldAggregateOperation ``` ## Enumeration Members | Member | Value | Description | | --- | --- | --- | | Any | "any" | Select any value. Implementation-dependent - this could be random, the first found, etc. | | Count | "count" | Count the number of values | | CountDistinct | "distinct" | Count the number of unique values | | CreateArray | "array_agg" | Collect all of the values into an array | | CreateArrayDistinct | "array_agg_distinct" | Collect all of the unique values into an array | | Invalid | "invalid" | Count only the valid values | | Max | "max" | Find the max value | | Mean | "mean" | Compute the mean of the values | | Median | "median" | Compute the median of the values | | Min | "min" | Find the min value | | Mode | "mode" | Compute the mode of the values | | Product | "product" | Compute the product of the values | | StandardDeviation | "stdev" | Compute the standard deviation of the values | | StandardDeviationPopulation | "stdevp" | Compute the population standard deviation of the values | | Sum | "sum" | Sum the values | | Valid | "valid" | Count only the valid (non-null, non-error) values | | Variance | "variance" | Compute the variance of the values |