skewness aggregate function

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime

Returns the skewness value calculated from values of a group.

Syntax 

skewness ( [ALL | DISTINCT ] expr ) [FILTER ( WHERE cond ) ]

This function can also be invoked as a window function using the OVER clause.

Arguments

  • expr: An expression that evaluates to a numeric.

  • cond: An optional Boolean expression filtering the rows used for aggregation.

Returns

A DOUBLE.

If DISTINCT is specified the function operates only on a unique set of expr values.

Examples 

> SELECT skewness(col) FROM VALUES (-10), (-20), (100), (1000), (1000) AS tab(col);
 0.3853941073355022

> SELECT skewness(DISTINCT col) FROM VALUES (-10), (-20), (100), (1000), (1000) AS tab(col);
 1.1135657469022011

> SELECT skewness(col) FROM VALUES (-1000), (-100), (10), (20) AS tab(col);
 -1.1135657469022011