Question

我有一张带有产品清单的表格我有一张包含商家名单的表格我有一张带有仓库清单的桌子。

我有一个WarehouseMerchant表，因此仓库可以分配许多商家。

我有一个WarehouseMerchantProduct表，因此商家可以将其产品列在仓库中

我有一个可以链接2个商家的商家链接表

MerchantLinkID      int 
MasterMerchantID    int 
LinkedMerchantID    int 
PreferenceOrder     int

我需要做的是传递产品ID并获得可以出售它的商家产品的唯一列表。

4条规则

如果商家有销售产品的关联商家，则不显示关联的商家产品
如果商家有链接商家也销售产品，但主商家库存水平为0，则只显示关联商家产品
如果商家有多个仓库库存，那么仓库商品表中会有一个首选订单来选择使用哪个仓库
每个商家应该只有一个产品才能全部运行

我一直绞尽脑汁试图找出解决方案。我正沿着游标的路走下去，但它变得有点笨拙。然后我被赋予了4条规则作为要求，将我送回绘图板。

如果有人能想到一个快速简单的基于设置的解决方案，那么我很乐意听到它。

以下是创建表和关系的脚本

 CREATE TABLE [dbo].[MW_Merchant](
    [MerchantID] [int] IDENTITY(1,1) NOT NULL,
    [MerchantName] [nvarchar](150) NOT NULL,
    [MerchantCode] [char](10) NOT NULL,
    [Active] [bit] NOT NULL,
 CONSTRAINT [PK_Merchant] PRIMARY KEY CLUSTERED 
(
    [MerchantID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY],
 CONSTRAINT [ucMerchantCode] UNIQUE NONCLUSTERED 
(
    [MerchantCode] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[MW_Warehouse]    Script Date: 04/30/2013 09:17:39 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[MW_Warehouse](
    [WarehouseID] [int] IDENTITY(1,1) NOT NULL,
    [WarehouseName] [nvarchar](150) NOT NULL,
    [WarehouseCode] [varchar](10) NOT NULL,
    [Active] [bit] NOT NULL,
 CONSTRAINT [PK_Warehouse] PRIMARY KEY CLUSTERED 
(
    [WarehouseID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[MW_WarehouseMerchantProduct]    Script Date: 04/30/2013 09:17:39 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[MW_WarehouseMerchantProduct](
    [WarehouseMerchantProductID] [int] IDENTITY(1,1) NOT NULL,
    [WarehouseID] [int] NOT NULL,
    [MerchantID] [int] NOT NULL,
    [ProductCode] [varchar](30) NOT NULL,
    [StockLevel] [int] NOT NULL,
    [Active] [bit] NOT NULL,
    [PriorityOrder] [int] NOT NULL,
 CONSTRAINT [PK_MW_WarehouseProduct] PRIMARY KEY CLUSTERED 
(
    [WarehouseMerchantProductID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[MW_WarehouseMerchant]    Script Date: 04/30/2013 09:17:39 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[MW_WarehouseMerchant](
    [WarehouseMerchantID] [int] IDENTITY(1,1) NOT NULL,
    [WarehouseID] [int] NOT NULL,
    [MerchantID] [int] NOT NULL,
    [Active] [bit] NOT NULL,
    [PreferenceOrder] [int] NOT NULL,
 CONSTRAINT [PK_MW_WarehouseMerchant] PRIMARY KEY CLUSTERED 
(
    [WarehouseMerchantID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object:  Table [dbo].[MW_MerchantLink]    Script Date: 04/30/2013 09:17:39 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[MW_MerchantLink](
    [MerchantLinkID] [int] IDENTITY(1,1) NOT NULL,
    [MasterMerchantID] [int] NOT NULL,
    [LinkedMerchantID] [int] NOT NULL,
    [PreferenceOrder] [int] NOT NULL,
 CONSTRAINT [PK_MW_MerchantLink] PRIMARY KEY CLUSTERED 
(
    [MerchantLinkID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object:  Default [DF_MW_WarehouseMerchant_PreferenceOrder]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchant] ADD  CONSTRAINT [DF_MW_WarehouseMerchant_PreferenceOrder]  DEFAULT ((10)) FOR [PreferenceOrder]
GO
/****** Object:  Default [DF_MW_WarehouseMerchantProduct_PriorityOrder]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchantProduct] ADD  CONSTRAINT [DF_MW_WarehouseMerchantProduct_PriorityOrder]  DEFAULT ((10)) FOR [PriorityOrder]
GO
/****** Object:  ForeignKey [FK_MW_MerchantLink_MW_Merchant]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_MerchantLink]  WITH CHECK ADD  CONSTRAINT [FK_MW_MerchantLink_MW_Merchant] FOREIGN KEY([MasterMerchantID])
REFERENCES [dbo].[MW_Merchant] ([MerchantID])
GO
ALTER TABLE [dbo].[MW_MerchantLink] CHECK CONSTRAINT [FK_MW_MerchantLink_MW_Merchant]
GO
/****** Object:  ForeignKey [FK_MW_MerchantLink_MW_Merchant1]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_MerchantLink]  WITH CHECK ADD  CONSTRAINT [FK_MW_MerchantLink_MW_Merchant1] FOREIGN KEY([LinkedMerchantID])
REFERENCES [dbo].[MW_Merchant] ([MerchantID])
GO
ALTER TABLE [dbo].[MW_MerchantLink] CHECK CONSTRAINT [FK_MW_MerchantLink_MW_Merchant1]
GO
/****** Object:  ForeignKey [FK_MW_WarehouseMerchant_MW_Merchant]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchant]  WITH CHECK ADD  CONSTRAINT [FK_MW_WarehouseMerchant_MW_Merchant] FOREIGN KEY([MerchantID])
REFERENCES [dbo].[MW_Merchant] ([MerchantID])
GO
ALTER TABLE [dbo].[MW_WarehouseMerchant] CHECK CONSTRAINT [FK_MW_WarehouseMerchant_MW_Merchant]
GO
/****** Object:  ForeignKey [FK_MW_WarehouseMerchant_MW_Warehouse]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchant]  WITH CHECK ADD  CONSTRAINT [FK_MW_WarehouseMerchant_MW_Warehouse] FOREIGN KEY([WarehouseID])
REFERENCES [dbo].[MW_Warehouse] ([WarehouseID])
GO
ALTER TABLE [dbo].[MW_WarehouseMerchant] CHECK CONSTRAINT [FK_MW_WarehouseMerchant_MW_Warehouse]
GO
/****** Object:  ForeignKey [FK_MW_WarehouseMerchantProduct_MW_Merchant]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchantProduct]  WITH CHECK ADD  CONSTRAINT [FK_MW_WarehouseMerchantProduct_MW_Merchant] FOREIGN KEY([MerchantID])
REFERENCES [dbo].[MW_Merchant] ([MerchantID])
GO
ALTER TABLE [dbo].[MW_WarehouseMerchantProduct] CHECK CONSTRAINT [FK_MW_WarehouseMerchantProduct_MW_Merchant]
GO
/****** Object:  ForeignKey [FK_MW_WarehouseProduct_MW_Warehouse]    Script Date: 04/30/2013 09:17:39 ******/
ALTER TABLE [dbo].[MW_WarehouseMerchantProduct]  WITH CHECK ADD  CONSTRAINT [FK_MW_WarehouseProduct_MW_Warehouse] FOREIGN KEY([WarehouseID])
REFERENCES [dbo].[MW_Warehouse] ([WarehouseID])
GO
ALTER TABLE [dbo].[MW_WarehouseMerchantProduct] CHECK CONSTRAINT [FK_MW_WarehouseProduct_MW_Warehouse]
GO

和一些测试数据

/****** Object:  Table [dbo].[MW_Merchant]    Script Date: 04/30/2013 09:41:50 ******/
SET IDENTITY_INSERT [dbo].[MW_Merchant] ON
INSERT [dbo].[MW_Merchant] ([MerchantID], [MerchantName], [MerchantCode], [Active]) VALUES (24, N'Merchant 1', N'MERCH1    ', 1)
INSERT [dbo].[MW_Merchant] ([MerchantID], [MerchantName], [MerchantCode], [Active]) VALUES (27, N'Merchant 2', N'MERCH2    ', 1)
INSERT [dbo].[MW_Merchant] ([MerchantID], [MerchantName], [MerchantCode], [Active]) VALUES (28, N'Merchant 3', N'MERCH3    ', 1)
SET IDENTITY_INSERT [dbo].[MW_Merchant] OFF
/****** Object:  Table [dbo].[MW_Warehouse]    Script Date: 04/30/2013 09:41:50 ******/
SET IDENTITY_INSERT [dbo].[MW_Warehouse] ON
INSERT [dbo].[MW_Warehouse] ([WarehouseID], [WarehouseName], [WarehouseCode], [Active]) VALUES (12, N'Warehouse 1', N'WARE1', 1)
INSERT [dbo].[MW_Warehouse] ([WarehouseID], [WarehouseName], [WarehouseCode], [Active]) VALUES (13, N'Warehouse 2', N'WARE2', 1)
INSERT [dbo].[MW_Warehouse] ([WarehouseID], [WarehouseName], [WarehouseCode], [Active]) VALUES (14, N'Warehouse 3', N'WARE3', 1)
SET IDENTITY_INSERT [dbo].[MW_Warehouse] OFF
/****** Object:  Table [dbo].[MW_WarehouseMerchantProduct]    Script Date: 04/30/2013 09:41:50 ******/
SET IDENTITY_INSERT [dbo].[MW_WarehouseMerchantProduct] ON
INSERT [dbo].[MW_WarehouseMerchantProduct] ([WarehouseMerchantProductID], [WarehouseID], [MerchantID], [ProductCode], [StockLevel], [Active], [PriorityOrder]) VALUES (93, 13, 24, N'TESTPRODUCT', 20, 1, 10)
INSERT [dbo].[MW_WarehouseMerchantProduct] ([WarehouseMerchantProductID], [WarehouseID], [MerchantID], [ProductCode], [StockLevel], [Active], [PriorityOrder]) VALUES (96, 14, 24, N'TESTPRODUCT', 20, 1, 10)
INSERT [dbo].[MW_WarehouseMerchantProduct] ([WarehouseMerchantProductID], [WarehouseID], [MerchantID], [ProductCode], [StockLevel], [Active], [PriorityOrder]) VALUES (97, 14, 27, N'TESTPRODUCT', 10, 1, 10)
SET IDENTITY_INSERT [dbo].[MW_WarehouseMerchantProduct] OFF
/****** Object:  Table [dbo].[MW_MerchantLink]    Script Date: 04/30/2013 09:41:50 ******/
SET IDENTITY_INSERT [dbo].[MW_MerchantLink] ON
INSERT [dbo].[MW_MerchantLink] ([MerchantLinkID], [MasterMerchantID], [LinkedMerchantID], [PreferenceOrder]) VALUES (22, 24, 27, 1)
INSERT [dbo].[MW_MerchantLink] ([MerchantLinkID], [MasterMerchantID], [LinkedMerchantID], [PreferenceOrder]) VALUES (23, 24, 28, 2)
SET IDENTITY_INSERT [dbo].[MW_MerchantLink] OFF

在示例数据中，我返回的行应该是WarehouseMerchantProductID 93 93,96和97都有库存，但是

93和96属于同一商家，应根据WarehouseMerchant表中的PreferenceOrder进行选择

商家27链接到24，所以不应该出现（除非24缺货）

Answer 1

注意，以下查询是针对Oracle编写的，并假设LinkedMerchant只有1个MasterMerchant。您可以使用代码here。另请注意，为了测试其他一些案例，我提供了比您提供的更多的测试数据。

SELECT MERCHANTID, WAREHOUSEID, PRODUCTCODE
FROM (
  SELECT 0
  , WMP.MERCHANTID
  , WMP.WAREHOUSEID
  , WMP.PRODUCTCODE
  , RANK() OVER (PARTITION BY ML.MASTERMERCHANTID, WMP.PRODUCTCODE ORDER BY ML.PREFERENCEORDER ASC NULLS LAST) MERCH_RANK
  , RANK() OVER (PARTITION BY WMP.MERCHANTID, WMP.PRODUCTCODE ORDER BY WM.PREFERENCEORDER ASC NULLS LAST) WARE_RANK
  FROM MW_WAREHOUSEMERCHANTPRODUCT WMP
    LEFT OUTER JOIN MW_WAREHOUSEMERCHANT WM ON 0=0
                AND WMP.MERCHANTID  = WM.MERCHANTID
                AND WMP.WAREHOUSEID = WM.WAREHOUSEID
    LEFT OUTER JOIN MW_MERCHANTLINK ML ON 0=0
                AND WMP.MERCHANTID = ML.LINKEDMERCHANTID
    LEFT OUTER JOIN MW_WAREHOUSEMERCHANTPRODUCT MASTER ON 0=0
                AND ML.MASTERMERCHANTID = MASTER.MERCHANTID
                AND WMP.PRODUCTCODE     = MASTER.PRODUCTCODE
  WHERE 0=0
    AND WMP.STOCKLEVEL > 0
    AND NVL(MASTER.STOCKLEVEL, 0) <= 0
)
WHERE 0=0
  AND MERCH_RANK = 1
  AND WARE_RANK  = 1
;

如何为困难的连接获得基于集合的解决方案

1 个答案: