Functions.ApproxCountDistinct 方法

參考

定義

命名空間:: Microsoft.Spark.Sql

組件:: Microsoft.Spark.dll

套件:: Microsoft.Spark v1.0.0

重要

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多載

ApproxCountDistinct(Column)	傳回群組中相異專案的近似數目。
ApproxCountDistinct(String)	傳回群組中相異專案的近似數目。
ApproxCountDistinct(Column, Double)	傳回群組中相異專案的近似數目。
ApproxCountDistinct(String, Double)	傳回群組中相異專案的近似數目。

ApproxCountDistinct(Column)

傳回群組中相異專案的近似數目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct(Microsoft.Spark.Sql.Column column);

static member ApproxCountDistinct : Microsoft.Spark.Sql.Column -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (column As Column) As Column

參數

column: Column

要套用的資料行

傳回

Column

Column 物件

適用於

ApproxCountDistinct(String)

傳回群組中相異專案的近似數目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct(string columnName);

static member ApproxCountDistinct : string -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (columnName As String) As Column

參數

columnName: String

資料行名稱

傳回

Column

Column 物件

適用於

ApproxCountDistinct(Column, Double)

傳回群組中相異專案的近似數目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct(Microsoft.Spark.Sql.Column column, double rsd);

static member ApproxCountDistinct : Microsoft.Spark.Sql.Column * double -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (column As Column, rsd As Double) As Column

參數

column: Column

要套用的資料行

rsd: Double

允許的最大估計錯誤

傳回

Column

Column 物件

適用於

ApproxCountDistinct(String, Double)

傳回群組中相異專案的近似數目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct(string columnName, double rsd);

static member ApproxCountDistinct : string * double -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (columnName As String, rsd As Double) As Column

參數

columnName: String

資料行名稱

rsd: Double

允許的最大估計錯誤

傳回

Column

Column 物件

適用於