17.05 - Example of How the Character Set is Determined for the Query - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

The character set of the expression in the first SELECT statement determines the character set of the entire query. In the following example, the character set of <char_expression_1> is used as the character set for the entire query:

SELECT <char_expression_1> FROM <table_1>
UNION
SELECT <char_expression_2> FROM <table_2>;

If <char_expression_2> contains characters not included in the character set of <char_expression_1>, an error can result.

For example, if <char_expression_1> is CHARACTER SET LATIN, but <char_expression_2> is CHARACTER SET UNICODE, attempting to translate <char_expression_2> from UNICODE to LATIN results in an error if multi-byte characters are present in <char_expression_2>.