查詢 - 分鐘（成本），並顯示供應商的成本

我一直堅持在MySQL查詢。該表是：查詢 - 分鐘（成本），並顯示供應商的成本

CREATE TABLE items_costs (
    UPC varchar(15) NOT NULL, 
    SupplierID int(11) NOT NULL, 
    Current_as_of_Date datetime DEFAULT NULL, 
    Cost1 float DEFAULT NULL, 
    Cost2 float DEFAULT NULL, 
    Cost3 float DEFAULT NULL, 
    MSRP float DEFAULT NULL, 
    MAP float DEFAULT NULL, 
    Unique_Entry_Id datetime DEFAULT NULL, 
    PRIMARY KEY (UPC,SupplierID), 
    KEY SupplierID (SupplierID), 
    CONSTRAINT items_costs_ibfk_1 FOREIGN KEY (UPC) REFERENCES items (UPC), 
    CONSTRAINT items_costs_ibfk_2 FOREIGN KEY (SupplierID) REFERENCES suppliers (SupplierID) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8`

我得到的最低COST1，Cost2，COST3的每個項目：

MIN(LEAST(IFNULL(ic.Cost3, ic.Cost1), IFNULL(ic.Cost2, ic.Cost1), ic.Cost1)) AS Cost

不過，現在我需要獲得與特定成本相關的供應商ID

我已經試過：

SELECT 
    ic.UPC, 
    ic.SupplierID, 
    ic.Current_as_of_Date, 
    ic.Cost1 AS Cost, 
    ic.MSRP, 
    ic.MAP, 
    s.SupplierName, 
    s.Map_YN AS Supplier_MAP 
FROM 
    items_costs AS ic 
     JOIN 
    suppliers AS s ON s.supplierId = ic.SupplierID 
WHERE 
    (ic.upc , ic.Cost1) IN (SELECT 
      ic_min.UPC, 
       MIN(LEAST(IFNULL(ic_min.Cost3, ic_min.Cost1), 
         IFNULL(ic_min.Cost2, ic_min.Cost1), 
         ic_min.Cost1)) AS Cost 
     FROM 
      items_costs ic_min 
     GROUP BY ic_min.UPC))

...這給通過UPC最低的成本，在其他線程建議。但是，仍然有重複的UPC，這應該是獨一無二的。

我在這裏做錯了什麼？

非常感謝！

來源

2017-07-04 Alex_L

你可以使用DISTINCT

SELECT DISTINCT 
     ic.UPC, 
     ic.SupplierID, 
     ic.Current_as_of_Date, 
     ic.Cost1 AS Cost, 
     ic.MSRP, 
     ic.MAP, 
     s.SupplierName, 
     s.Map_YN AS Supplier_MAP 
    FROM items_costs AS ic 
    JOIN suppliers AS s ON s.supplierId = ic.SupplierID 
    WHERE (ic.upc , ic.Cost1) IN (
     SELECT 
       ic_min.UPC, 
       MIN(LEAST(IFNULL(ic_min.Cost3, ic_min.Cost1), 
         IFNULL(ic_min.Cost2, ic_min.Cost1), 
         ic_min.Cost1)) AS Cost 
      FROM items_costs ic_min 
      GROUP BY ic_min.UPC))

來源

2017-07-04 18:39:37 scaisEdge

感謝您的幫助！

我找到了答案在這裏，它似乎是一個普遍的問題：https://dev.mysql.com/doc/refman/5.6/en/example-maximum-column-group-row.html

SELECT 
ic1.upc, 
ic1.supplierid, 
ic1.MSRP, 
ic1.MAP, 
ROUND((LEAST(IFNULL(ic1.Cost3, ic1.Cost1), 
       IFNULL(ic1.Cost2, ic1.Cost1), 
       ic1.Cost1)), 
     2) AS Cost, 
s.SupplierName, 
s.Map_YN AS Supplier_MAP 
FROM 
items_costs AS ic1 

    JOIN 
suppliers AS s ON s.supplierid = ic1.supplierid 

WHERE 
ic1.cost1 = (SELECT 
     MIN(ic2.cost1) 
    FROM 
     items_costs AS ic2 
    WHERE 
     ic1.upc = ic2.upc)

來源

2017-07-05 04:24:23

查詢 - 分鐘（成本），並顯示供應商的成本

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