Question

The code below is giving me the error:

column ‘id’ in field list is ambiguous.

I added the productr2011 to it and it started doing that. If I take out the product2011 from the query then it works just fine.

SELECT id, itemName, itemRUDate, Sum(itemsSold) AS SumOf
FROM productr
WHERE itemRUDate >= '2012/03/03' AND itemRUDate <= '2012/03/03'
GROUP BY itemName

UNION

SELECT id, itemName, itemRUDate, Sum(itemsSold) AS SumOf
FROM productr2010, productr2011
WHERE itemRUDate >= '2012/03/03' AND itemRUDate <= '2012/03/03'
GROUP BY itemName
ORDER BY SumOf DESC;

Why does it work with just the product2010 and not when it has product2010, product2011?

Update

I am just trying to combine old archive records to a search. Hints why I am adding all data from 2010 and 2011 (usually the query dates should be of 2011 and not 2012) :o)

Answer 1

You sure you want to do a join between product2010 and product2011? I am not sure about your exact requirement, but this maybe what you are looking for:

    SELECT id, itemName, itemRUDate, Sum(itemsSold) AS SumOf
    FROM productr
    WHERE itemRUDate >= '2012/03/03' AND itemRUDate <= '2012/03/03'
    GROUP BY itemName
UNION
    SELECT id, itemName, itemRUDate, Sum(itemsSold) AS SumOf
    FROM productr2010
    WHERE itemRUDate >= '2012/03/03' AND itemRUDate <= '2012/03/03'
    GROUP BY itemName
UNION
    SELECT id, itemName, itemRUDate, Sum(itemsSold) AS SumOf
    FROM productr2011
    WHERE itemRUDate >= '2012/03/03' AND itemRUDate <= '2012/03/03'
    GROUP BY itemName
ORDER BY SumOf DESC;