17.05 - Character Data Import Process - 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)

Consider the following table definition:

     CREATE TABLE table_1 (
       cunicode  CHARACTER(10) CHARACTER SET  UNICODE,
       clatin    CHARACTER(10) CHARACTER SET LATIN,
       csjis     CHARACTER(10) CHARACTER SET KANJISJIS,
       cgraphic  CHARACTER(10) CHARACTER SET GRAPHIC,
       cgraphic2 CHARACTER(10) CHARACTER SET GRAPHIC);

Suppose the session character set is KanjiShift-JIS and you submit the following request:

     USING
      cunicode  (CHARACTER(10)),
      clatin    (CHARACTER(10)),
      csjis     (CHARACTER(10)),
      cgraphic  (GRAPHIC(10)),
      cgraphic2 (CHARACTER(10) CHARACTER SET GRAPHIC))
     INSERT INTO table_1(:cunicode, :clatin, :csjis, :cgraphic,
                         :cgraphic2);
The USING request modifier indicates that the data parcel contains the following:
  • 10 KanjiShift-JIS bytes for the Unicode column
  • 10 bytes for the Latin column
  • 10 bytes for the KanjiSJIS column
  • 20 bytes for the first GRAPHIC column
  • 20 bytes for the second GRAPHIC column

Individual fields in the data parcel are converted from the client form-of-use to the server form-of-use. After conversion, the first three fields are treated as Unicode literals and the last two fields are treated as GRAPHIC literals (see Teradata Vantage™ - Data Types and Literals, B035-1143).

The column data is then converted to the target fields using implicit translation according to the rules listed in Teradata Vantage™ - Data Types and Literals, B035-1143.

The conversion process is described by the following table.

Stage Process
  These bytes are converted to server form-of-use … Treated as this kind of literal … Converted to this character data type … And stored in this column …
1 first 10 (1 - 10) UNICODE none cunicode
2 next 10 (11 - 20) UNICODE LATIN clatin
3 next 10 (21-30) UNICODE KANJISJIS csjis
4 next 20 (31 - 50) GRAPHIC GRAPHIC cgraphic
5 last 20 (51 - 70) GRAPHIC GRAPHIC cgraphic2

Note that the meaning of the USING clause is independent of the session character set.