在针对mysql的ALTER TABLE中添加约束时出现SQL语法错误

我有另一个SQL错误，它说

您的SQL语法有错误；检查与您的MySQL服务器版本对应的手册，以了解在“添加约束”附近使用的正确语法

fk_org1_id

外键（

org_id

）引用

organization

（'o'位于第1行）

我不知道为什么会出现这个错误，事实上，我正确地遵循了在ALTERTABLE中添加约束的正确语法。有人能帮我吗

以下是我的sql代码：

ALTER TABLE `administration`
ADD CONSTRAINT `fk_stud3_id` FOREIGN KEY (`stud_ID`) REFERENCES   `student` (`stud_ID`),
ADD CONSTRAINT `fk_faculty3_ID` FOREIGN KEY (`faculty_ID`) REFERENCES `faculty` (`faculty_ID`);
ADD CONSTRAINT `fk_org1_id` FOREIGN KEY (`org_ID`) REFERENCES `organization` (`org_ID`)

ALTER TABLE `student_list`
ADD CONSTRAINT `fk_stud4_id` FOREIGN KEY (`stud_ID`) REFERENCES `student` (`stud_ID`),
ADD CONSTRAINT `fk_admin2_id` FOREIGN KEY (`admin_ID`) REFERENCES `administration` (`admin_ID`);

---

您在错误的位置终止了查询

您的查询是：

ALTER TABLE `administration`
ADD CONSTRAINT `fk_stud3_id` FOREIGN KEY (`stud_ID`) REFERENCES   `student` (`stud_ID`),
ADD CONSTRAINT `fk_faculty3_ID` FOREIGN KEY (`faculty_ID`) REFERENCES `faculty` (`faculty_ID`);
ADD CONSTRAINT `fk_org1_id` FOREIGN KEY (`org_ID`) REFERENCES `organization` (`org_ID`)

应该是-

ALTER TABLE `administration`
ADD CONSTRAINT `fk_stud3_id` FOREIGN KEY (`stud_ID`) REFERENCES   `student` (`stud_ID`),
ADD CONSTRAINT `fk_faculty3_ID` FOREIGN KEY (`faculty_ID`) REFERENCES `faculty` (`faculty_ID`),
ADD CONSTRAINT `fk_org1_id` FOREIGN KEY (`org_ID`) REFERENCES `organization` (`org_ID`);

---

小错误，删除分号

ALTER TABLE `administration` ADD CONSTRAINT `fk_stud3_id` FOREIGN KEY (`stud_ID`) REFERENCES   `student` (`stud_ID`),
ADD CONSTRAINT `fk_faculty3_ID` FOREIGN KEY (`faculty_ID`)
    REFERENCES `faculty` (`faculty_ID`);// here change semicolon to comma.
ADD CONSTRAINT `fk_org1_id` FOREIGN KEY (`org_ID`) 
    REFERENCES `organization` (`org_ID`); // add semicolon here.

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分号应该是逗号