SQL 错误 : "There are no primary or candidate keys in the referenced table..."

Question

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.

Answer 1

根据实际模型需要/要求，一种解决方案是引用 Key，这需要 所有 部分(注意 Nom_Giac 已添加到 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，另一种解决方案是将 ID_Reunion 列设为键(注意 Nom_Giac 已从 PK 定义中删除):

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

这将使 ID_Reunion 成为一个键(实际上是主键)，然后可以使用 foreign key references Reunion(ID_Reunion) 引用它。

编码愉快!