SQL错误:“引用的表中没有主键或候选键...”

时间:2012-05-25 00:58:04

标签: sql sql-server sql-server-2008 foreign-keys

我正在使用SQL Server 2008.当我尝试创建表'Dossier_Financement'时出现错误:

create table Dossier_Financement 
(
    ID_Reunion integer foreign key references Reunion(ID_Reunion),
    ID_Dossier integer foreign key references Dossier(ID_Dossier),
    Decision varchar(20),
    Motif text,
    Montant_Retenu decimal(6,2),/* montant accorder */
    Duree_Retenu smallint,/*nb jours accorder */
    Nom_Giac varchar(50) foreign key references GIAC(Nom_Giac),
    primary key(ID_Dossier,Nom_Giac,ID_Reunion)
)
GO

这是两个表:

create table Reunion 
(
    ID_Reunion integer ,
    Date_Reunion datetime,
    ID_Membre integer,/*jquery*/
    Type_Reunion varchar(20),
    Nom_Giac varchar(50),
    foreign key(ID_Membre,Nom_Giac) references Membre(ID_Membre,Nom_Giac),
    primary key(ID_Reunion,Nom_Giac)
)
GO


create table Dossier_Financement 
(
    ID_Reunion integer foreign key references Reunion(ID_Reunion),
    ID_Dossier integer foreign key references Dossier(ID_Dossier),
    Decision varchar(20),
    Motif text,
    Montant_Retenu decimal(6,2),/* montant accorder */
    Duree_Retenu smallint,/*nb jours accorder */
    Nom_Giac varchar(50) foreign key references GIAC(Nom_Giac),
    primary key(ID_Dossier,Nom_Giac,ID_Reunion)
)
GO

'Reunion'正常执行没有任何问题,但在尝试创建第二个表时出现此错误:

Msg 1776, Level 16, State 0, Line 1
There are no primary or candidate keys in the referenced table 'Reunion' that match the referencing column list in the foreign key 'FK__Dossier_F__ID_Re__5629CD9C'.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.

3 个答案:

答案 0 :(得分:3)

您只能使用要引用的表的完整主键创建外键。您的第二个表尝试仅使用Reunion表的主键的一半来创建外键。

答案 1 :(得分:3)

根据实际的模型需求/要求,一个解决方案是引用Key,它需要所有部分(注意Nom_Giac被添加到FK定义中):

create table Dossier_Financement 
(
    ...
    foreign key(ID_Reunion,Nom_Giac) references Reunion(ID_Reunion,Nom_Giac),
)

根据Mark M的回答,另一个解决方案是将ID_Reunion列设为Key(请注意,Nom_Giac已从PK定义中删除):

create table Reunion 
(
    ...
    primary key(ID_Reunion)
)

这将使ID_Reunion成为密钥(实际上是主密钥),然后可以使用foreign key references Reunion(ID_Reunion)引用它。

快乐的编码!

答案 2 :(得分:2)

在要创建索引的列上创建唯一索引:

CREATE UNIQUE NONCLUSTERED INDEX [UX_Index] ON dbo.[Table]([Column1],[Column2])