Question

I know this can be confusing, but please bear with me on this one.

I have two SELECT queries with a minor difference which returns pretty much the same result set.

SELECT products_id,options_values_id
    FROM products_attributes pa
    LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )
    WHERE products_id ='574' and pa.options_id!=6
    and pa.options_id!=3
    AND products_options_type = 6
    GROUP BY products_id,options_values_id
    ORDER BY products_id,products_options_sort_order,options_id

The second query varies at products_options_type

SELECT products_id,options_values_id
    FROM products_attributes pa
    LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )
    WHERE products_id ='574' and pa.options_id!=6
    and pa.options_id!=3
    AND products_options_type = 2
    GROUP BY products_id,options_values_id
    ORDER BY products_id,products_options_sort_order,options_id

And the results returned by them are

574|193
574|204

AND

574|25
574|3

I want the output as

574|193|25
574|204|3

What I tried is:

SELECT pa.products_id,pa.options_values_id,ord.options_values_id
        FROM products_attributes pa
        LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )


        LEFT JOIN(SELECT products_id,options_values_id
        FROM products_attributes pa
        LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )
        WHERE products_id ='574' and pa.options_id!=6
        and pa.options_id!=3
        AND products_options_type = 2
        GROUP BY products_id,options_values_id
        ORDER BY products_id,products_options_sort_order,options_id)ord ON pa.products_id=ord.products_id


        WHERE paproducts_id ='574' and pa.options_id!=6
        and pa.options_id!=3
        AND products_options_type = 2
        GROUP BY pa.products_id,pa.options_values_id
        ORDER BY pa.products_id,products_options_sort_order,options_id

However this returns

574|193|25
574|204|25

I am not too good with joins, so any idea if and how this can be done?

Answer 1

Try this

SELECT a.products_id,a.options_values_id, b.options_values_id
FROM (SELECT @rownum:=@rownum+1 'rw', products_id, options_values_id
FROM (SELECT @rownum:=0) r, products_attributes pa
LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )
WHERE products_id ='574' and pa.options_id!=6
and pa.options_id!=3
AND products_options_type = 6
GROUP BY products_id,options_values_id
ORDER BY products_id,products_options_sort_order,options_id) a,
(SELECT @rownum:=@rownum+1 'rw', products_id,options_values_id
FROM (SELECT @rownum:=0) r, products_attributes pa
LEFT JOIN products_options po ON ( pa.options_id = po.products_options_id )
WHERE products_id ='574' and pa.options_id!=6
and pa.options_id!=3
AND products_options_type = 2
GROUP BY products_id,options_values_id
ORDER BY products_id,products_options_sort_order,options_id) b
WHERE a.products_id=b.products_id and a.rw=b.rw;

Hope this helps.