Skewness (Teradata Database) - Teradata Warehouse Miner

Teradata Warehouse Miner User Guide - Volume 2ADS Generation

Product
Teradata Warehouse Miner
Release Number
5.4.4
Published
July 2017
Language
English (United States)
Last Update
2018-05-03
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B035-2301
Product Category
Software

This function is only available when connected to a Teradata database.

An enhanced version of the standard skew function is supported, generating SKEW (expression) and returning a type of float. When dragging a Skewness into a variable, the following tree element is created.

Variable Creation > Input > Variables: SQL Elements pane - Aggregation > Skewness

Columns and/or other non-aggregate expressions can be moved over the (empty) branch of the tree.

The enhancement consists of the ability to compute the skew of a date expression, generating SKEW (date expression - DATE '1900-01-01').

The standard option to compute the skew over distinct values only is also provided, resulting in the generation of SKEW(DISTINCT expression). This option is enabled through the Properties panel. Double-click on Skewness, or highlight it and click Properties.

Variable Creation > Input > Variables: SQL Elements pane - Aggregation > Skewness Properties