外键错误 SQL Server 2012

Question

我在 SQL Server 2012

中添加外键时遇到问题

 create table Predracun
    (
    PredracunID int not null identity(1,1),
    Iznos nvarchar(255),
    Datum date,
    Opis nvarchar(255)
    )

create table Racun
(
RacunID int not null identity (1,1),
Sifra nvarchar(255),
BrojRacuna nvarchar(255)
)

create table Prijem
(
PrijemID int not null identity (1,1),
Datum date,
Opis nvarchar(255)
)

alter table Prijem
add constraint FK_PrijemPredracun
foreign key (PredracunID)
references Predracun (PredracunID)

以这种方式添加

我收到错误消息

Msg 1769, Level 16, State 1, Line 1 Foreign key 'FK_UredjajPrijem' references invalid column 'PrijemID' in referencing table 'Uredjaj'. Msg 1750, Level 16, State 0, Line 1 Could not create constraint. See previous errors.

Answer 1

tableprijem 中不存在 PredracunID 列。因此它不能用作外键。

Answer 2

使用以下脚本：

CREATE TABLE Predracun
(
    PredracunID int not null identity(1,1),
    Iznos nvarchar(255),
    Datum date,
    Opis nvarchar(255)
    PRIMARY KEY CLUSTERED 
    (
        [PredracunID] ASC
    )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

create table Racun
(
    RacunID int not null identity (1,1),
    Sifra nvarchar(255),
    BrojRacuna nvarchar(255)
)

create table Prijem
(
    PrijemID int not null identity (1,1),
    PredracunID int,
    Datum date,
    Opis nvarchar(255)
)

alter table Prijem
add constraint FK_PrijemPredracun
foreign key (PredracunID)
references Predracun (PredracunID)

注意：只能在引用 table 的主键列或唯一键列上创建外键。您的脚本中遗漏了两件事。

Predracun table 没有任何键（唯一或主）列
要在 Prijem table 中创建外键，您必须在 create table 语句中包含 PredracunID 列。

外键错误 SQL Server 2012

Error with foreign key SQL Server 2012

sql

tsql

sql-server

ddl