Question

我正在尝试在我的数据库中创建一个表“SIGNATURE”我希望这个表有一个双主键，并为引用表“TRAITEMENT”的主键添加一个外键约束

CREATE TABLE TRAITEMENT (
id INTEGER NOT NULL,
dateHeurePrevue DATETIME NOT NULL,
commentaire LONGTEXT,
dateValidation TIMESTAMP,
CONSTRAINT PK PRIMARY KEY (id,dateHeurePrevue),
CONSTRAINT FK_traitement_consigne FOREIGN KEY (id) REFERENCES consigne(id))     ENGINE=InnoDB;
create unique index id_dateheureprevue on traitement(id, dateheureprevue);

CREATE TABLE SIGNATURE (
id INTEGER NOT NULL,
idPersonne INTEGER NOT NULL,
dateTimeTraitement DATETIME NOT NULL,
retard INTEGER,
motifRetard INTEGER,
heureEffectiveTraitement DATETIME NOT NULL,
CONSTRAINT PK PRIMARY KEY (id,dateTimeTraitement),
CONSTRAINT FK_id FOREIGN KEY (id) REFERENCES traitement(id),
CONSTRAINT FK_idPersonne FOREIGN KEY (idPersonne) REFERENCES personne(id),
CONSTRAINT FK_motifRetard FOREIGN KEY (motifRetard) REFERENCES retard(id),
CONSTRAINT FK_dateTimeTraitement FOREIGN KEY (dateTimeTraitement) REFERENCES traitement(dateHeurePrevue))ENGINE=InnoDB;
create unique index id_dateTimetraitement on signature(id, dateTimeTraitement);

显然（我试图删除它并且工作正常）问题来自这个forign键：

CONSTRAINT FK_dateTimeTraitement FOREIGN KEY (dateTimeTraitement) REFERENCES traitement(dateHeurePrevue)

我不明白，我没有看到任何类型的冲突，钥匙...... 如果有人能帮我解决这个问题......

提前致谢

Answer 1

您的外键必须与主键字段完全相同，所以：

CONSTRAINT FK_dateTimeTraitement FOREIGN KEY (id, dateTimeTraitement) REFERENCES traitement(id, dateHeurePrevue)

MySql 5.6.17错误＃1215 - 无法添加外键约束

1 个答案: