16.20 - TOP m PERCENT and Rounding - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

If ( m *COUNT(*)/100.0) does not evaluate to an integer value, then Teradata Database rounds it up to the next highest integer value; otherwise, the intended result is not achieved. The following table shows how rounding occurs:

IF (m*COUNT(*)/100.0) evaluates to this value … THEN the system rounds it up to this value …
0.1                                          1
9.2                                        10

Teradata Database only applies this rounding up to the first 15 digits following the decimal point. For example, if ( m *COUNT(*)/100.0) evaluates to 0.0000000000000001, or 1 x 10-16, then the system does not round it up to 1.