Question

我正在寻找执行此操作的正确方法。我正在使用Azure SQL。

摘要：我可以创建这样的约束：

 CONSTRAINT [UC_constraint_name] UNIQUE NONCLUSTERED ([field1_this_table] ASC, [field2_this_table] ASC, [Parent_Table].[Field_In_Parent_Table]) ASC)

详细信息

我有两个表，一个订单表和一个项目表。一个订单将包含多个项目。每个订单都分配给一个客户。每个项目都有分配给它的唯一条形码。条形码目前在客户级别上是唯一的。因此，客户1可以具有与客户2相同的条形码，但是他们不能具有内部重复的条形码。

简单直接。

我对item_detail表的当前约束是：

   CONSTRAINT [UC_unique_scan_code_customer_id] UNIQUE NONCLUSTERED ([customer_id] ASC, [unique_scan_code] ASC),

现在，我们有一个客户正在不同地理区域复制条形码。因此，他们的西海岸工厂可能使用与中西部工厂相同的条形码。它们在每个地理区域仍然是唯一的。

我在名为'customer_geo_zone_number'的订单级别添加了一个新字段（和相关表，但这无关紧要），这样分配给该订单的所有商品都将用于该geo_zone。

我的问题是，我应该在项目级别复制字段“ customer_geo_zone_number”，还是可以以某种方式使用父订单表进行唯一约束？

我最初的解决方案是仅添加字段，但这似乎通过在两个相关的表中存储相同的字段“ customer_geo_zone_number”来破坏数据库规范化规则。

这是我尝试添加（到我的项目表）的约束，但这不是正确的语法（但是它显示了我想要做的事情）：

CONSTRAINT [UC_unique_scan_code_customer_id2] UNIQUE NONCLUSTERED ([customer_id] ASC, [unique_scan_code] ASC, [Order_Detail.customer_geo_zone_number]),

如果有帮助，这里是当前项目表SQL：

CREATE TABLE [dbo].[item_detail] (
[Id]               INT             IDENTITY (1, 1) NOT NULL,
[job_id]           BIGINT          NULL,
[order_id]         BIGINT          NULL,
[customer_id]      INT             NOT NULL,
[unique_scan_code] VARCHAR (100)   NOT NULL,
[item_description] VARCHAR (100)   NULL,
[cust_code_1]      VARCHAR (100)   NULL,
[cust_code_2]      VARCHAR (100)   NULL,
[cust_code_3]      INT             NULL,
[cust_code_4]      DECIMAL (18, 2) NULL,
[container_type]   INT             NULL,
[record_created]   DATETIME        DEFAULT (getdate()) NOT NULL,
[send_XML_flag]    BIT             DEFAULT ((1)) NOT NULL,
[dt_item_seq_no]   INT             NULL,
CONSTRAINT [PK_item_detail] PRIMARY KEY CLUSTERED ([Id] ASC),
CONSTRAINT [UC_unique_scan_code_customer_id] UNIQUE NONCLUSTERED ([customer_id] ASC, [unique_scan_code] ASC),
CONSTRAINT [FK_item_detail_To_Customer_Detail] FOREIGN KEY ([customer_id]) REFERENCES [dbo].[Customer_Detail] ([Id]),
CONSTRAINT [FK_item_detail_To_Order_Detail] FOREIGN KEY ([order_id]) REFERENCES [dbo].[Order_Detail] ([Id]) ON DELETE CASCADE
);

这是订单表sql：

CREATE TABLE [dbo].[Order_Detail] (
[Id]                           BIGINT          IDENTITY (1, 1) NOT NULL,
[customer_id]                  INT             NOT NULL,
[dt_unique_id]                 INT             NULL,
[dt_customer_no]               INT             NULL,
[customer_BOL]                 VARCHAR (50)    NULL,
[customer_unique_id]           VARCHAR (50)    NOT NULL,
[customer_invoice_number]      VARCHAR (50)    NULL,
[customer_order_number]        VARCHAR (50)    NULL,
[customer_po_number]           VARCHAR (50)    NULL,
[customer_stop_id]             VARCHAR (50)    NULL,
[customer_route_id]            VARCHAR (50)    NULL,
[customer_terminal_id]         VARCHAR (50)    NULL,
[customer_del_route_seq_alpha] VARCHAR (50)    NULL,
[customer_del_route_seq_num]   INT             NULL,
[customer_misc_Vref_1]         VARCHAR (50)    NULL,
[customer_misc_Vref_2]         VARCHAR (50)    NULL,
[customer_misc_Vref_3]         VARCHAR (50)    NULL,
[customer_misc_Vref_4]         VARCHAR (50)    NULL,
[customer_misc_Cref_1]         CHAR (1)        NULL,
[customer_misc_Cref_2]         CHAR (1)        NULL,
[customer_misc_Cref_3]         CHAR (1)        NULL,
[customer_misc_Cref_4]         CHAR (1)        NULL,
[customer_misc_Nref_1]         DECIMAL (18)    NULL,
[customer_misc_Nref_2]         DECIMAL (18)    NULL,
[customer_misc_Nref_3]         DECIMAL (18, 2) NULL,
[customer_misc_Nref_4]         DECIMAL (18, 2) NULL,
[Order_notes]                  VARCHAR (MAX)   NULL,
[Pickup_Location_Id]           INT             NULL,
[Delivery_Location_Id]         INT             NULL,
[requested_pu_date]            DATETIME        NULL,
[requested_del_date]           DATETIME        NULL,
[expected_item_qty]            INT             NULL,
[record_created]               DATETIME        DEFAULT (getdate()) NOT NULL,
[revenue_terminal_id]          INT             NULL,
[initial_route_id]             INT             NULL,
[delivery_branch_id]           INT             NULL,
[customer_geo_zone_number]     INT             NULL DEFAULT 0,
CONSTRAINT [PK_Order_Detail] PRIMARY KEY CLUSTERED ([Id] ASC),
CONSTRAINT [unique_cust_id_Orders_cust_unique_id] UNIQUE NONCLUSTERED ([customer_id] ASC, [customer_unique_id] ASC),
CONSTRAINT [FK_Order_Detail_To_Customer_Detail] FOREIGN KEY ([customer_id]) REFERENCES [dbo].[Customer_Detail] ([Id]),
CONSTRAINT [FK_Order_Detail_To_Terminal_Detail] FOREIGN KEY ([revenue_terminal_id]) REFERENCES [dbo].[Terminal_Detail] ([Id]),
CONSTRAINT [FK_Order_Detail_To_Common_Address] FOREIGN KEY ([Delivery_Location_Id]) REFERENCES [dbo].[Common_Address_Point] ([Id]),
CONSTRAINT [FK_Order_Detail_To_Common_Address2] FOREIGN KEY ([Pickup_Location_Id]) REFERENCES [dbo].[Common_Address_Point] ([Id]),
CONSTRAINT [FK_Order_Detail_To_Route_Detail] FOREIGN KEY ([initial_route_id]) REFERENCES [dbo].[route_detail] ([Id])
);

Answer 1

有人告诉我这是不可能的（可能是为什么没有建议的解决方案）我将其关闭。

根据相关父表中的字段添加SQL唯一约束

1 个答案: