- Byte
If any argument is a byte type, all other arguments must also be byte types.
- Numeric
A numeric argument is converted to a character string using the format for the numeric value. For details about implicit numeric to character data type conversion, see “Implicit Numeric-to-Character Conversion”
- Character
When the arguments are both character types, but have different server character sets, then implicit string conversion occurs. For details, see "Implicit Character-to-Character Translation" in Teradata Vantage™ - Data Types and Literals, B035-1143.
- UDTs that have implicit casts to a predefined character type.
To define an implicit cast for a UDT, use the CREATE CAST statement and specify the AS ASSIGNMENT clause. For more information on CREATE CAST, see Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.
Implicit type conversion of UDTs for system operators and functions, including the concatenation operator, is a Teradata extension to the ANSI SQL standard. To disable this extension, set the DisableUDTImplCastForSysFuncOp field of the DBS Control Record to TRUE. For details, see Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.
For more information on implicit type conversion of UDTs, see "Data Type Conversions" in Teradata Vantage™ - Data Types and Literals, B035-1143.
Use the concatenation operator on strings and string expressions of type: