错误代码： 1064

1、错误描述

1 queries executed, 0 success, 1 errors, 0 warnings

查询：create table example3( id Primary key, stu_id int, constraint c_fk foreign key(stu_id,course_id) references example2(stu_id,cour...

错误代码： 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 'Primary key,
      stu_id int,
      constraint c_fk foreign key(stu_id,course_i' at line 2

执行耗时   : 0 sec
传送时间   : 0 sec
总耗时      : 0 sec

2、错误原因

CREATE TABLE example1(
      stu_id INT PRIMARY KEY,
      stu_name VARCHAR(20),
      stu_sex BOOLEAN
      );
 
 CREATE TABLE example2(
      stu_id INT,
      course_id INT,
      grade FLOAT,
      PRIMARY KEY(stu_id,course_id)
      );
      
CREATE TABLE example3(
      id PRIMARY KEY,
      stu_id INT,
      CONSTRAINT c_fk FOREIGN KEY(stu_id,course_id)
      REFERENCES example2(stu_id,course_id)
      );
      

    在新建example3表时，未给id数据类型

3、解决办法

CREATE TABLE example3(
      id INT PRIMARY KEY,
      stu_id INT,
      CONSTRAINT c_fk FOREIGN KEY(stu_id,course_id)
      REFERENCES example2(stu_id,course_id)
      );

1 queries executed, 0 success, 1 errors, 0 warnings

查询：create table example3( id int Primary key, stu_id int, constraint c_fk foreign key(stu_id,course_id) references example2(stu_id,...

错误代码： 1072
Key column 'course_id' doesn't exist in table

执行耗时   : 0 sec
传送时间   : 0 sec
总耗时      : 0.001 sec