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我不断收到以下错误：* #1005 - 无法创建表 'classorganizer.turma' (errno: 150) (Detalhes...) *

尽管我已经仔细检查了该类中的所有外键案例，但我试图创建表 Turma。有谁知道出了什么问题？

谢谢！

CREATE TABLE Usuario(
email VARCHAR(50) NOT NULL,
nome VARCHAR(30),
senha INTEGER NOT NULL,
dataCadastro DATE NOT NULL,

CONSTRAINT pkUsu PRIMARY KEY(email),
CONSTRAINT formatoEmail CHECK(email LIKE '%@%.%')
)ENGINE=InnoDB;

CREATE TABLE Professor(
id INTEGER NOT NULL AUTO_INCREMENT,
nome VARCHAR(30) NOT NULL UNIQUE,
ranking INTEGER DEFAULT 3,
usuario VARCHAR(50) NOT NULL,

CONSTRAINT pk_prof PRIMARY KEY (id),
CONSTRAINT fk_usu FOREIGN KEY (usuario) REFERENCES Usuario(email) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT limites_rank CHECK(ranking >0 AND ranking<6)
)ENGINE=InnoDB;

CREATE TABLE Materia(
codigo VARCHAR(8) NOT NULL,
nro_turmas INTEGER DEFAULT 0,
nome VARCHAR(20) NOT NULL UNIQUE,
nro_cred_aula INTEGER DEFAULT 0,
nro_cred_trab INTEGER DEFAULT 0,
prioridade INTEGER DEFAULT 3,
usuario VARCHAR(50) NOT NULL,

CONSTRAINT pk_prof PRIMARY KEY (id),
CONSTRAINT fk_usu FOREIGN KEY (usuario) REFERENCES Usuario(email) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT limites_prio CHECK(prioridade >0 AND prioridade<6)
)ENGINE=InnoDB;

CREATE TABLE Turma(
nro INTEGER NOT NULL AUTO_INCREMENT,
prioridade INTEGER DEFAULT 3,
materia VARCHAR(8) NOT NULL,
professor INTEGER NOT NULL,
usuario VARCHAR(50) NOT NULL,

CONSTRAINT pk_turma PRIMARY KEY (nro),
CONSTRAINT fk_mat FOREIGN KEY (materia) REFERENCES Materia(codigo) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT fk_prof FOREIGN KEY (professor) REFERENCES Professor(id) ON DELETE SET NULL ON UPDATE CASCADE,
CONSTRAINT fk_usu FOREIGN KEY (usuario) REFERENCES Usuario(email) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT limites_prio CHECK(prioridade >0 AND prioridade<6)
)ENGINE=InnoDB;
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1 回答 1

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有很多错误。

  1. CONSTRAINT pk_prof PRIMARY KEY (id). id表中不存在列Materia。
  2. 约束名称（pk_prof、fk_usu）已在Professor表中使用。你已经在Materia和Turma表中使用了它。通过选择唯一的名称来更正它。最简单的方法是省略名称。MySQL 处理它。
  3. codigo的列Materia 在表中被引用Turma，但它不是 * key。*
  4. professor 的列Turma定义为NOT NULL。但是你用过ON DELETE SET NULL。
于 2012-01-28T21:15:29.520 回答