Question

我试图让下面的查询显示每个商店的每件商品我们拥有的每件商品的数量。它工作得很好，我创建了临时表来尝试提高速度但我的问题是，如果表没有某个产品的行根本没有显示产品。

我想显示所有四种产品（prodNo），无论该特定商店是否有任何行。

我研究了这个网站，找不到类似的东西让我弄明白。

CREATE TEMPORARY TABLE IF NOT EXISTS temp_invoice_dates AS
(
    SELECT Invoice_detail.del_date,invoice_Detail.StoreNo,mast_stores.SDesc, invoice_Detail.ProdNo,sold_qty,retn_price,retn_qty,sold_price FROM Invoice_detail 
        LEFT JOIN mast_stores on invoice_detail.StoreNO=mast_stores.Snum 
        LEFT  JOIN invoice on invoice_detail.Del_Date=invoice.Del_Date and invoice_detail.Invoice_No=invoice.Invoice_No  
        WHERE Cnum IN ('200','210') AND invoice_detail.Del_Date >= "2016-03-01" AND invoice_detail.Del_Date < "2016-04-01"
);

SELECT 
    temp_invoice_dates.StoreNo,
    temp_invoice_dates.SDesc,
    DATE_FORMAT(temp_invoice_dates.Del_Date,'%Y') as Year,
    DATE_FORMAT(temp_invoice_dates.Del_Date,'%M') as Month,
    temp_invoice_dates.ProdNo,
    mast_items.IDesc,
    SUM(sold_qty) as TotalIn,
    SUM(retn_qty) as TotalOut,
    ROUND(SUM((sold_qty*sold_price)-(retn_qty*retn_price)),2) as NetSales,
    CONCAT(ROUND(SUM(retn_qty)/SUM(sold_qty),2)*100,'%') as StalePerc
    FROM mast_Items 
    LEFT JOIN temp_invoice_dates on temp_invoice_dates.ProdNo=mast_items.Inum 
    WHERE mast_items.Inum in ('3502','3512','4162','4182')
    GROUP BY temp_invoice_dates.StoreNo, ProdNo
    ORDER BY temp_invoice_dates.StoreNo, ProdNo;

Drop table temp_invoice_dates;

结果类似于：

StoreNo  Product  Count....  
1        1        1
1        2        5
1        3        2
1        4        1
2        1        14
2        2        1
2        4        4
3        2        33
3        3        3

我喜欢的地方

StoreNo  Product  Count ....  
1        1        1
1        2        5
1        3        2
1        4        1
2        1        14
2        2        1
2        3        0
2        4        4
3        1        0
3        2        33
3        3        3
3        4        0

Answer 1

这样的事情应该有效。

SELECT sp.StoreNo, sp.ProdNo
    , ...stuff...
    , sp.IDesc, sp.SDesc
    , ...more stuff...
FROM (
   SELECT i.Inum AS ProdNo, s.Snum AS StoreNo
        , i.IDesc, s.SDesc
   FROM mast_Items AS i, mast_stores AS s
   WHERE i.Inum IN ('3502','3512','4162','4182')
   ) AS sp
LEFT JOIN temp_invoice_dates AS tid 
   ON sp.ProdNo = tid.ProdNo 
   AND sp.StoreNo = tid.StoreNo
GROUP BY sp.StoreNo, sp.ProdNo
ORDER BY sp.StoreNo, sp.ProdNo
;

通常我建议不要使用交叉连接（如子查询中所示），但在这种情况下，它正是所需要的。如果查询速度很慢，您可以事先将子查询结果插入到临时表中，对其进行索引，然后使用临时表代替子查询。

（编辑：当可用于分组和结果时，应使用sp字段）

显示项目，即使0行包含

1 个答案: