Setting Other Field Properties for External Tables

For INTERVAL DAY TO SECOND data type:

Leading Field Precision
Set the number of digits in the leading field. Accepted values are 0 to 9. The default is 2.

Fractional Seconds Precision
Set the number of digits in the fractional part of the SECOND datetime field. Accepted values are 1 to 9.

For INTERVAL YEAR TO MONTH data type:

Year Precision
Set the number of digits in the year. The default is 2.

For TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE data types:

Fractional Seconds Precision
Set the number of digits in the fractional part of the SECOND datetime field. Accepted values are 1 to 9.

For CHAR, VARCHAR2 data types:

Unit
Set the unit either in BYTE or CHAR.

For COMPLEX data types:

Object Schema
Set the object schema for the field.

Object Type
Set the object type for the field.