Question

Table #1: qa_returns_items

Table #2: qa_returns_residues

I have a long time trying to get this Result:

item_code -   item_quantity
2         -   1
3         -   2

---

IF qa_returns_items.item_code = qa_returns_residues.item_code AND status_code = 11 THEN

item_quantity = qa_returns_items.item_quantity –
qa_returns_residues.item_quantity

ELSEIF qa_returns_items.item_code = qa_returns_residues.item_code AND status_code = 12 THEN

item_quantity = qa_returns_items.item_quantity +
qa_returns_residues.item_quantity

ELSE

show diferendes

END IF

I tried this Query:

select  SubQueryAlias.item_code, 
        item_quantity
from    (
        select  
                ri.item_code
        ,       case status_code
                when 11 then ri.item_quantity - rr.item_quantity 
                when 12 then ri.item_quantity + rr.item_quantity
                end as item_quantity
        from    qa_returns_residues rr
        left join    qa_returns_items ri
        on      ri.item_code = rr.item_code
        WHERE ri.returnlog_code = 1
        ) as SubQueryAlias
where   item_quantity > 0 GROUP BY (item_code);

The query returns this result:

item_code -   item_quantity
1         -   2
2         -   2

Answer 1

I solved my problem:

SELECT  
        item_code, 
        item_quantity, 
        item_unitprice, 
        item_subtotal, 
        item_discount, 
        item_total 
FROM (
        SELECT  qa_returns_items.item_code, 
                qa_returns_items.item_quantity, 
                qa_returns_items.item_unitprice, 
                qa_returns_items.item_subtotal, 
                qa_returns_items.item_discount, 
                qa_returns_items.item_total 
        FROM qa_returns_items 
        WHERE returnlog_code = 1
    UNION
        SELECT  qa_returns_residues.item_code, 
                qa_returns_residues.item_quantity, 
                qa_returns_residues.item_unitprice, 
                qa_returns_residues.item_subtotal, 
                qa_returns_residues.item_discount, 
                qa_returns_residues.item_total 
        FROM qa_returns_residues 
        WHERE returnlog_code = 1 
        ORDER BY item_code ASC
) 
AS SubQueryAlias
WHERE item_code NOT IN (
                        SELECT a.item_code 
                        FROM qa_returns_items a 
                        JOIN qa_returns_residues b 
                            ON b.item_code = a.item_code 
                        WHERE a.returnlog_code = 1 
                            AND b.returnlog_code = 1
                        );