Teradata Parallel Data Pump

Chapter 3: Teradata TPump Commands
FIELD
Syntax Element
datadesc
nullexpr
nullexpr
Continued
Description
Type and length of data in the field.
Teradata TPump generates the USING phrase accordingly with the
user-assigned field name to which the body of the DML statement refers.
Condition used for selectively inserting a null value into the affected column
The condition is specified as a conditional expression involving any number of
fields, each represented by its fieldname, and constants. All fieldnames appearing
in the conditional expression must be defined by any of the following
specifications:
1 The startpos and datadesc parameters of the FIELD command.
2 A FILLER command.
3 A TABLE command.
If the specified condition is true, Teradata TPump sends the data to Teradata
Database with indicators, whether or not the INDICATORS option is specified
on the LAYOUT command.
When the character set of the job script is different from the client character set
used for the job (for example, on z/OS the job script must be in Teradata
EBCDIC when using the UTF-8 client character set, or UTF-16 client character
set can be used with the job script in UTF-8), Teradata TPump will translate the
string constants specified in the expression and the import data referenced in
the expression to the same character set before evaluating the expression.
For example, when the client character set is UTF-16 and the script character
set is UTF-8, if the following commands are given:
.field C1 * varchar(20);
.field C2 * varchar(40) nullif c1 = 'DELETED';
Teradata TPump will translate the data in the C1 field to the UTF-8 form and
compare it with the UTF-8 form of 'DELETED' to obtain the evaluation result.
Similarly, on the mainframe, when the client character set is UTF8 and the script
character set is Teradata EBCDIC, if the following commands are given:
.field C1 * char(20);
.field C2 * rchar(40) nullif c1 = 'removed';
Teradata TPump will translate the data in the C1 field from the UTF8 form to
the Teradata EBCDIC form and compare it to the Teradata EBCDIC form of
'removed' to obtain the valuation result.
Caution: When using UTF8 client set on the mainframe, be sure to examine
the definition in International Character Set Support to determine the
code points of the special characters which might be required.
Different versions of EBCDIC do not always agree as to the
placement of these characters.
The mappings between Teradata EBCDIC and Unicode can be
referred to in Appendix E of International Character Set Support.
The fieldname1 parameter in other FIELD commands can be referenced in
nullexpr.
134 Teradata Parallel Data Pump Reference