mysql - 合并来自2个供应商相同产品但不同ID的两个mysql表

Question

我正在从事零售业务项目，但对 MySql 数据有一些问题。 我们有来自 2 个供应商的 2 张 table 。 有些产品使用相同的名称不同的 ID，但有些则不然。有些产品只有供应商 A 才能提供。

Supplier A
ProductID  productName
A1         Product 1
A2         Product 2


Supplier B
ProductID  productName
B1         Product 1
B2         Product 2.0
B3         Product 3

I want to create new table with our own Product id to use it as primary product data.

Products table
ProductID, A,    B,  productName 
P1          A1    B1   Product 1              
P2          A2    null Product 2
P3          null  B2   Product 2.0
P4          null  B3   Product 3

谢谢。

Answer 1

我建议三张 table 。第一个是 Products 表，其名称是从提供产品的供应商中选择的。第二个是 Suppliers 表，其中包含有关供应商的信息。第三个是 ProductSuppliers，每个供应商和产品一行。示例数据为:

create table Products (
    ProductId int not null auto_increment primary key,
    ProductName
);

create table Suppliers (
    SupplierId int not null auto_increment primary key,
    SupplierName
);

create table ProductSuppliers (
    ProductSuppliersId int not null auto_increment primary key,
    ProductId int not null references Products(ProductId),
    SupplierId int not null references Suppliers(SupplierId),
    SupplierProductCode varchar(255)
);

然后您可以从表格中填充这些内容:

insert into Products(ProductName)
    select ProductName
    from SupplierA
    union
    select ProductName
    from SupplierB;

insert into Suppliers(SupplierName)
    select 'A' union all select 'B';


insert into SupplierProducts(SupplierId, ProductId, SupplierProductCode)
    select s.SupplierId, p.ProductId, a.ProductCode
    from SupplierA a join
         Products p
         on a.ProductName = p.ProductName cross join
         (select SupplierId from Suppliers where SupplierName = 'A') s;

insert into SupplierProducts(SupplierId, ProductId, SupplierProductCode)
    select s.SupplierId, p.ProductId, b.ProductCode
    from SupplierB b join
         Products p
         on b.ProductName = p.ProductName cross join
         (select SupplierId from Suppliers where SupplierName = 'B') s;