Online Documentation for Data Import for Oracle
Add/Edit field
When you import data with destination table creation, you can manage this table's fields.
Use the context menu to New/Edit/Drop a colimn.
Selecting New column or Edit column context menu item opens the field editor that allows you to view/edit the properties of the destination table fields.
Use the Column edit box to set the field name. Note that the name of the field must be unique among all the field names in the table.
The Type tab defines the type of the field data.
Size
Defines the size of the field value.
Scale
For numeric and decimal types you need to define the number of decimal to the right of the decimal point.
Default value
Define this option value if you need inserted records to get specified value.
Not NULL
Check this option to prevent the entry of NULL or unknown values in column.