16.20 - Possible Result Overflow with SELECT Sum - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1145-162K
Language
English (United States)

Possible Result Overflow with SELECT Sum

When using this function, the result can create an overflow when the data type and format are not in sync. For a column defined as:

Salary Decimal(15,2) Format ‘$ZZZ,ZZ9.99’

The following query:

SELECT SUM (Salary) FROM Employee;

causes an overflow because the decimal operand and the format are not in sync.

To avoid possible overflows, explicitly specify the format for decimal sum to specify a format large enough to accommodate the decimal sum resultant data type.

SELECT Sum(Salary) (format ‘$Z,ZZZ,ZZZ,ZZ9.99) FROM Employee;