There is no way to display the data type of existing columns in tables. You can
only see the data type of new columns as you create them using "create column".
This feature is abolutely necessary in order to develop against existing
('legacy') databases where original setup files may be unavailable. All other
similar tools has this feature.
The columns data types and sizes are displayed in the Properties windows (choose
Window - Properties from the menu). But this window is hard to discover, I
consider the bug valid. Marking as dup of issue #63708.
*** This issue has been marked as a duplicate of 63708 ***