mysql - 无法弄清楚此代码的 SQL 语法

Question

自从我尝试将此代码粘贴到 phpmyadmin 数据库时，我执行 SQL 已经很久了，它不会创建表，我收到错误消息:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NOT NULL PRIMARY KEY, WORKER CHAR(30), CONSTRAINT WORKER_FK FOREIGN KEY(WORKE' at line 2

这是 sql 表的代码:

CREATE TABLE REPORT(
 REPORT_ID NOT NULL PRIMARY KEY,
  WORKER CHAR(30) CONSTRAINT WORKER_FK FOREIGN KEY(WORKER) REFERENCES WORKER(WORKER_ID)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  CLIENT CHAR (30) CONSTRAINT CLIENT_FK FOREIGN KEY(client) REFERENCES CLIENT(CLIENT_ID)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
 START_DATE DATE CONSTRAINT STARTDATE_FK FOREIGN KEY(JOB) REFERENCES JOB(START_DATE)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  END_DATE DATE CONSTRAINT ENDDATE_FK FOREIGN KEY(JOB) REFERENCES JOB(END_DATE)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  COMMENT CHAR(30)
 )engine innoDB;

谁能帮帮我

Answer 1

实际的错误消息来自 report_id 没有数据类型这一事实。

REPORT_ID NOT NULL PRIMARY KEY,

应该是

REPORT_ID INTEGER NOT NULL PRIMARY KEY,

但是你还有很多问题。 “内联”外键被 MySQL 默默地忽略——即使是 InnoDB。你必须把它们移到最后。

此外，您的工作表外键不正确。首先，您的表中没有 job 列，因此 FOREIGN KEY(JOB) REFERENCES JOB(END_DATE) 不可能是正确的。

其次，您将两个不同的 PK 定义引用到同一个表。我猜你真的想要:

CONSTRAINT START_END_DATE_FK 
   FOREIGN KEY (START_DATE, END_DATE) 
   REFERENCES JOB(START_DATE, END_DATE)
ON UPDATE CASCADE
ON DELETE SET NULL,

这假设 (START_DATE, END_DATE) 是 JOB 表的主键——这听起来有点奇怪。

不确定 comment 是否是 MySQL 中的保留字。如果是，则需要引用列名。

综上所述，您可能需要这样的东西:

CREATE TABLE REPORT
(
  REPORT_ID INTEGER NOT NULL PRIMARY KEY,
  WORKER CHAR(30) ,
  CLIENT CHAR (30),
  START_DATE DATE ,
  END_DATE DATE,
  COMMENT CHAR(30),
  CONSTRAINT WORKER_FK FOREIGN KEY(WORKER) REFERENCES WORKER(WORKER_ID)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  CONSTRAINT CLIENT_FK FOREIGN KEY (client) REFERENCES CLIENT(CLIENT_ID)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  CONSTRAINT START_END_DATE_FK FOREIGN KEY (START_DATE, END_DATE) REFERENCES JOB(START_DATE, END_DATE)
  ON UPDATE CASCADE
  ON DELETE SET NULL,
  CONSTRAINT ENDDATE_FK FOREIGN KEY(JOB) REFERENCES JOB(END_DATE)
  ON UPDATE CASCADE
  ON DELETE SET NULL
 );