Question

当需要从同一个表引用两列时，我需要在数据库中创建一个视图。我可以创建一个这样的视图：

CREATE VIEW [dbo].[ViewJournal]
AS 
    SELECT 
        J. d, J.date, J.drac, L.name as draccount, J.crac,
        L.name as craccount, J.dramt, J.cramt, J.lf,
        J.description, J.voucherType, J.reg_date, J.last_update,
        J.active 
    FROM 
        Journal J, Ledger L 
    WHERE 
        J.drac = L.Id

但结果并没有显示实际结果。

此处，crac和drac来自Ledger表格。

Journal表：

CREATE TABLE [dbo].[Journal] 
(
   [Id]             DECIMAL (18)    IDENTITY (1, 1) NOT NULL,
   [date]           DATETIME        NULL,
   [drac]           DECIMAL (18)    NULL,
   [crac]           DECIMAL (18)    NULL,
   [dramt]          DECIMAL (18, 2) NULL,
   [cramt]          DECIMAL (18, 2) NULL,
   [reg_date]       DATETIME        NULL,
   [last_update]    DATETIME        NULL,
   [active]         INT             NULL,
   [lf]             VARCHAR (50)    NULL,
   [description]    NVARCHAR (150)  NULL,
   [voucherType]    VARCHAR (50)    NULL,
   [sales]          VARCHAR (50)    NULL,
   [purchase]       VARCHAR (50)    NULL,
   [cash_paymentno] VARCHAR (50)    NULL,
   [cash_receiptno] VARCHAR (50)    NULL,
   [expense]        VARCHAR (50)    NULL,
   [income]         VARCHAR (50)    NULL,
   [advance]        VARCHAR (50)    NULL,
   [remunaration]   VARCHAR (50)    NULL,

   CONSTRAINT [PK_Journal] PRIMARY KEY CLUSTERED ([Id] ASC),
   CONSTRAINT [FK_Ledger] FOREIGN KEY ([drac]) REFERENCES [dbo].[Ledger] ([Id]) ON DELETE CASCADE ON UPDATE CASCADE
);

Ledger表：

CREATE TABLE [dbo].[Ledger] 
(
    [Id]             DECIMAL (18)  IDENTITY (1, 1) NOT NULL,
    [name]           NVARCHAR (50) NULL,
    [type]           NVARCHAR (50) NULL,
    [classification] VARCHAR (50)  NULL,
    [realornominal]  VARCHAR (50)  NULL,
    [reg_date]       DATETIME      NULL,
    [last_update]    DATETIME      NULL,
    [active]         DECIMAL (2)   NULL,
    [depree]         VARCHAR (50)  NULL,

    CONSTRAINT [PK_Ledger] PRIMARY KEY CLUSTERED ([Id] ASC)
);

Answer 1

在您当前的查询中，您加入了J.drac = L.Id，这意味着L始终是J.drac中引用的记录，无论{的值是多少{1}}。

我理解它的方式，你想在J.crac表中引用两个不同的记录。你需要两个连接。

Ledger

我需要在数据库中创建一个视图

1 个答案: