where the following is true:
- datadesc
- Type and length of data in the field
- fieldname
- Optional name of an input record field
- The fieldname specification can be referenced by:
- The NULLIF nullexpr expression of a FIELD command
- The condition expression of the APPLY clause of an IMPORT command
- A fieldname specification must obey the same construction rules as Teradata SQL column names.
- startpos
- Starting position of the specified field in the data records of an external data source
- The startpos can be defined as:
- An unsigned integer, which is a character position starting with 1
- An asterisk, which means the next available character position beyond the preceding field