Home > Building Queries with Query... > Selecting Objects > About Supported Column Types
Columns of all types available in Oracle Database 10g Release (10.2) display as objects in the Design pane. Note the following column restrictions:
You may only select a maximum of 60 columns for each query.
The following column types are not selectable and cannot be included in a generated query:
BLOB
NCLOB
RAW
LONG
LONG RAW
XMLType
Any other nonscalar column types