MySql 5.6.17错误＃1215 - 无法添加外键约束

Question

我试着在我的数据库中创建一个表“SIGNATURE”我想要这个表有一个双主键，并将外键约束添加到两个主键引用表“TRAITEMENT”

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，（我想删除它，它工作得很好）的问题来源于此forign键：

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

我不明白，我不看到任何类型的冲突，键... 如果有人能帮我解决这个问题LEM ...

在此先感谢

Answer 1

你的外键必须正好等于主键字段，所以：

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