Teradata Parallel Data Pump

Chapter 3: Teradata TPump Commands
DELETE
condition such as underflow, overflow, or division by zero, is treated as an error, and Teradata
TPump records both row and error code in the error table.
The DELETE statement must identify only one object.
Remember the following when constructing scripts:
• A DELETE statement can be applied to either a table or view, provided that the view does
not specify a join.
• Equality values for all the primary index columns should normally be specified in the
WHERE clause.
The OR construct can be used in the WHERE clause of a DELETE statement; alternatively,
two or more separate DML statements (one per OR term) can be used, with the DML
statements applied conditionally with the APPLY clause of the IMPORT command. The
nature of the alternatives will usually make one of the methods more appropriate.
• The column(s) specified in this clause need not be a part of any index, but can be one or
more nonindexed columns. This clause may specify nonequality values for any
combination of columns of unique indices, or any values for other columns.
• The maximum number of INSERT, UPDATE, and DELETE statements that can be
referenced in an IMPORT is 128. The 128th DML which would cause the insertion of the
DML sequence number of 128 for the DMLSEQ field in the error table could lead to
Teradata Database 3520 error.
• The maximum number of DML statements that can be packed into a request is 2430. The
default number of statements packed is 20.
DML validtime qualifier and NONTEMPORAL semantics are supported. For more
information, see SQL Data Manipulation Language and SQL Data Manipulation Language
Advanced Topics.
Example
The following example uses an input data source containing a series of one-field, four-byte
records. Each record contains the value (EmpNum) of the primary index column (EmpNo) of
a row to be deleted from the Employee table.
.BEGIN LOAD SESSION number;
.LAYOUT Layoutname;
.FIELD EmpNum 1 INTEGER;
.DML LABEL DMLlabelname;
DELETE Employee WHERE EmpNo = :EmpNum;
.IMPORT INFILE Infilename LAYOUT Layoutname APPLY DMLlabelname;
.END LOAD;
112 Teradata Parallel Data Pump Reference