Categories:: Data metric functions

SKEW (system data metric function)¶

Returns the sample skewness of the values in the specified column in a table.

This topic provides the syntax for calling the function directly. To learn how to associate the function with a table or view so it runs at regular intervals, see Associate a DMF.

Syntax¶

SNOWFLAKE.CORE.SKEW(<query>)

Arguments¶

query: Specifies a SQL query that projects a single column.

Allowed data types¶

The column projected by the query must have one of the following data types:

FLOAT
NUMBER

Returns¶

The function returns a FLOAT value. NULL values are ignored. The function returns NULL if the column contains fewer than three non-NULL values, or if all of its values are the same.

Usage notes¶

The function uses the same sample formula as the SKEW aggregate function. A symmetric distribution has a skewness of 0.

Example¶

Measure the skewness in the order_total column:

SELECT SNOWFLAKE.CORE.SKEW(
  SELECT
    order_total
  FROM sales.tables.orders
);