Alias required in SELECT list of cursors to avoid duplicate column names

Question

I got some error messages while compiling the following.
DECLARE
     alert_id                              NUMBER;
     CURSOR cur_search IS SELECT c.item_description,
     d.name modelname,
     SUM(b.quentaty),
     SUM(b.balence)
     FROM      item_procurement_history_dtl a,
                    item_procurement_history b,
                    item_master c,
                    model_master d
     WHERE a.item_code = b.item_code
     AND a.lot_no = b.lot_no
     AND a.item_code = c.item_code
     AND b.modelcode = d.modelcode
     AND (c.item_description LIKE '%'||:blk_stock_search_fields.item_name||'%' OR :blk_stock_search_fields.item_name IS NULL)
     AND (d.name LIKE '%'||:blk_stock_search_fields.modelname||'%' OR :blk_stock_search_fields.modelname IS NULL)
     AND (a.status = :blk_stock_search_fields.status OR :blk_stock_search_fields.status IS NULL)
     GROUP BY c.item_description, d.name
     ORDER BY c.item_description, d.name;
BEGIN
     GO_BLOCK('blk_stock_search_fields');
     CLEAR_BLOCK(NO_VALIDATE);
     FOR i IN cur_search LOOP
     :blk_stock_search_data.item_name                := i.item_description;
          :blk_stock_search_data.modelname               := i.modelname;
          :blk_stock_search_data.tot_qty                    := i.tot_qty;
          :blk_stock_search_data.available_qty     := i.available_qty;
          NEXT_RECORD;
     END LOOP;
     FIRST_RECORD;
     GO_ITEM('blk_stock_search_fields.pb_search');
END;
The error is as follows :-
Error 403 at line 23 column 2
Alias required in SELECT list of cursors to avoid duplicate column names.
What will be the solution for this error?
Thanx and Regards,
Vikas

Answer 1

Vikas,
The problem is that you are referencing a column name in your LOOP that does not exist in your CURSOR. Therefore, Oracle has interpreted this to its BEST guess Exception. This can be resolved as follows:
DECLARE
   alert_id NUMBER;
   CURSOR cur_search IS
      SELECT c.item_description,
             d.name modelname,
             /* You need to ALIAS the product of the SUM() so you can reference it by name.*/
             SUM(b.quentaty) AS tot_qty,
             /* Same issue here, you must ALIAS the SUM() of Balance in order to reference it by a name.*/
             SUM(b.balence) as available_qty
        FROM item_procurement_history_dtl a,
             item_procurement_history b,
             item_master c,
             model_master d
       WHERE a.item_code = b.item_code
         AND a.lot_no = b.lot_no
         AND a.item_code = c.item_code
         AND b.modelcode = d.modelcode
         AND (c.item_description LIKE '%'||:blk_stock_search_fields.item_name||'%' OR :blk_stock_search_fields.item_name IS NULL)
         AND (d.name LIKE '%'||:blk_stock_search_fields.modelname||'%' OR :blk_stock_search_fields.modelname IS NULL)
         AND (a.status = :blk_stock_search_fields.status OR :blk_stock_search_fields.status IS NULL)
       GROUP BY c.item_description, d.name
       ORDER BY c.item_description, d.name;
BEGIN
   GO_BLOCK('blk_stock_search_fields');
   CLEAR_BLOCK(NO_VALIDATE);
   FOR i IN cur_search LOOP
      :blk_stock_search_data.item_name := i.item_description;
      :blk_stock_search_data.modelname := i.modelname;
      :blk_stock_search_data.tot_qty := i.tot_qty;
      :blk_stock_search_data.available_qty := i.available_qty;
      NEXT_RECORD;
   END LOOP;
   FIRST_RECORD;
   GO_ITEM('blk_stock_search_fields.pb_search');
END;Just an observation. Also, There are some misspellings in your cursor. Does this match your table?
Hope this helps.
Craig...