sql - 在 SQL Server 中插入或删除的输出

Question

我有一张SalesTransaction桌子Invoice：

Create Table SalesTransaction
(
    SalesTransactionId int Identity(1,1) Primary Key, 
    CustomerId int Foreign key references Customer(CustomerId) ,
    ProductId int  Foreign key references Product(ProductID),
    Price money, 
    Quantity int, 
    Total money, 
    InvoiceId int
)

和

Create Table Invoice
(
     InvoiceId int  Primary Key, 
     InvoiceAmount money Not Null ,
     BalanceAmount money,
     AmountPaid money Not Null
)

我想要的是Invoiceid从表到表Invoice的标签InvoiceId。SalesTransaction

起初InvoiceIdofSalesTransaction为NULL，发票表数据添加后，应标记回InvoiceIdofSalesTransaction表

Answer 1

第一个解决方案（只有一个新的外键）

对于以下架构

Create Table Invoice
(
     InvoiceId int Primary Key, 
     InvoiceAmount money Not Null ,
     BalanceAmount money,
     AmountPaid money Not Null
)

Create Table SalesTransaction
(
    SalesTransactionId int Identity(1,1) Primary Key, 
    CustomerId int Foreign key references Customer(CustomerId) ,
    ProductId int  Foreign key references Product(ProductID),
    Price money, 
    Quantity int, 
    Total money, 
    InvoiceId int Foreign key references Invoice(InvoiceId)
)

这是您的 INSERT/UPDATE 查询

DECLARE @SalesTransactionId as int
DECLARE @InvoiceId as int

INSERT INTO [dbo].[SalesTransaction]
           ([CustomerId]
           ,[ProductId]
           ,[Price]
           ,[Quantity]
           ,[Total]
           ,[InvoiceId])
     VALUES
           (1
           ,1
           ,1
           ,1
           ,1
           ,NULL)

SET @SalesTransactionId = SCOPE_IDENTITY()
SET @InvoiceId = 1

INSERT INTO [dbo].[Invoice]
           ([InvoiceId]
           ,[InvoiceAmount]
           ,[BalanceAmount]
           ,[AmountPaid])
     VALUES
           (@InvoiceId
           ,1
           ,1
           ,1)

UPDATE [dbo].[SalesTransaction]
   SET [InvoiceId] = @InvoiceId
 WHERE SalesTransactionId = @SalesTransactionId
GO

我还建议您将表的列设置InvoiceId为Invoice身份。

第二种解决方案（使用新的外键和发票 pk 的身份）

对于以下架构

Create Table Invoice
(
     InvoiceId int Identity(1,1) Primary Key, 
     InvoiceAmount money Not Null ,
     BalanceAmount money,
     AmountPaid money Not Null
)

Create Table SalesTransaction
(
    SalesTransactionId int Identity(1,1) Primary Key, 
    CustomerId int Foreign key references Customer(CustomerId) ,
    ProductId int  Foreign key references Product(ProductID),
    Price money, 
    Quantity int, 
    Total money, 
    InvoiceId int Foreign key references Invoice(InvoiceId)
)

这是您的 INSERT/UPDATE 查询

DECLARE @SalesTransactionId as int
DECLARE @InvoiceId as int

INSERT INTO [dbo].[SalesTransaction]
           ([CustomerId]
           ,[ProductId]
           ,[Price]
           ,[Quantity]
           ,[Total]
           ,[InvoiceId])
     VALUES
           (1
           ,1
           ,1
           ,1
           ,1
           ,NULL)

SET @SalesTransactionId = SCOPE_IDENTITY()

INSERT INTO [dbo].[Invoice]
           ([InvoiceAmount]
           ,[BalanceAmount]
           ,[AmountPaid])
     VALUES
           (1
           ,1
           ,1)

SET @InvoiceId = SCOPE_IDENTITY()

UPDATE [dbo].[SalesTransaction]
   SET [InvoiceId] = @InvoiceId
 WHERE SalesTransactionId = @SalesTransactionId
GO