Mysql 查询-min(成本)并显示该成本的供应商
我被一个MySQL查询卡住了。表格如下:Mysql 查询-min(成本)并显示该成本的供应商,mysql,Mysql,我被一个MySQL查询卡住了。表格如下: 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 DE
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`
每件商品的成本是1、2、3中最低的:
MIN(LEAST(IFNULL(ic.Cost3, ic.Cost1), IFNULL(ic.Cost2, ic.Cost1), ic.Cost1)) AS Cost
但是,现在我需要获取与该特定成本相关联的供应商ID
我试过:
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))
…这使得UPC的成本最低,正如在其他线程中所建议的那样。但是,仍然会得到重复的UPC,这应该是唯一的
我在这里做错了什么
非常感谢 您可以使用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))
你可以使用不同的
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))
谢谢你的帮助
我在这里找到了答案,这似乎是一个常见的问题:
谢谢你的帮助
我在这里找到了答案,这似乎是一个常见的问题: