skewness
aggregate function
Applies to: Databricks SQL 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
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