Teradata Parallel Data Pump

Chapter 3: Teradata TPump Commands
UPDATE Statement and Atomic Upsert
UPDATE Statement and Atomic Upsert
Purpose
Teradata TPump supports the UPDATE Teradata SQL statement, which changes field values in
existing rows of a table.
Syntax
where
,
UPDATE tname SET cname = expr WHERE conditional ;
UPD
3021A036
Syntax Element
tname
cname
expr
WHERE condition
Description
Table or view to be updated
This table was previously identified as tname in the BEGIN LOAD command.
If tname is not explicitly qualified by database name, the current default
database qualifies it.
Column whose value is to be replaced by the value of expr
The column named must not be a column of the primary index.
Expression whose resulting value is to replace the current value of the
identified column
The expression can contain any combination of constants, current values of
columns of the referenced row, or values from fields of input data records.
References to fields of input data records are as follows:
:fieldname
where :fieldname is defined by a FIELD command or TABLE command of the
layout referenced by an IMPORT using this UPDATE.
Conditional clause specifying the row or rows to be updated
The conditional clause can use values from fields of input data records by
referring to their field names as follows:
:fieldname
where fieldname is defined by a FIELD command or TABLE command.
Equality values for all the columns of the primary index must be explicitly
specified in this clause.
188 Teradata Parallel Data Pump Reference