In this example, you use SQL Developer to delete the po_requestor_name column that you added to the purchase_orders table in "Example: Adding Table Columns".
To delete the PO_REQUESTOR_NAME column:
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In SQL Developer, navigate to the PURCHASE_ORDERS table in the HR schema, following the instructions in "Viewing Tables".
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Right-click the PURCHASE_ORDERS table and select Edit.
The Edit Table dialog box appears.
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In the Columns section, click the PO_REQUESTOR_NAME column, and then click the red X icon.
The PO_REQUESTOR_NAME column is removed from the list of columns.
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Click OK.
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On the PURCHASE_ORDERS table tab in the object pane, click the Columns subtab to view the list of columns in the table.