HomeOracle Page 3 - How to Use the Oracle SQL Developer Tool
Verifying objects in the database - Oracle
Now there is a standalone graphic user interface that you can use to develop your SQL with Oracle databases. The many things you do in Oracle 10G XE can also be carried out with the Oracle SQL Developer. It is expected to enhance productivity in your Oracle applications.
Expand the Tables node to view all the tables that exist. Expand the NorthEmployees table and you can click any column and modify some of the properties as shown.
You may click on any table to see the data it contains as shown in the next picture.
This way you can see all related Information for the table like the columns, Data, Constraints, etc.