Query Error - Help Please

Question

The query below returns this error message: "ORA-00918: column ambiguously defined" It points to the last line of the query, at 'Colour' before the equals....
WITH  ranked_data  As
     SELECT Members_Order.Catalogue_ID, Item.Item_Description, Item.Colour, Item.Hire_Charge, Members_Order.Number_of_Days, (Hire_Charge * Number_of_Days) AS Total, Item.Colour, RANK () OVER (ORDER BY Hire_Charge * Number_of_Days DESC) AS rnk
     FROM Members_Order, Item
     WHERE Members_Order.Item_ID = Item.Item_ID
SELECT * FROM ranked_data
WHERE Colour  = (SELECT  Colour FROM ranked_data WHERE rnk = 1);Could anyone help?
Edited by: user10945931 on 16-Apr-2009 10:54

Answer 1

Hi,
TRy this code.
REgards Salim.
WITH ranked_data AS
     (SELECT members_order.catalogue_id, item.item_description, item.colour,
             item.hire_charge, members_order.number_of_days,
             (hire_charge * number_of_days) AS total, item.colour,
             RANK () OVER (ORDER BY hire_charge * number_of_days DESC) AS rnk
        FROM members_order, item
       WHERE members_order.item_id = item.item_id)
SELECT t.*
  FROM ranked_data t
WHERE t.colour = (SELECT t1.colour
                   FROM ranked_data t1
                  WHERE t1.rnk = 1);