17.10 - Example - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

The following example returns the average number of rows per row hash, where columns date_field and time_field constitute the primary index of the table eventlog.

   SELECT COUNT(*) / COUNT(DISTINCT HASHROW (date_field,time_field)) 
   FROM eventlog;

If columns date_field and time_field qualify for a unique index, this example returns the average number of rows with the same hash synonym.