我遇到以下问题:更新MySQL语句
我试图在Comp中添加每个学生。科学。部成当然,这里是的DDL关系:
所需当然具有值( '小样科学' 'CS-001', '每周研讨会',,0)
Department
(dept_name [primary key], building, budget)
Course
(course_id [primary key], title, dept_name, credits)
Instructor
(ID [primary key], name, dept_name, salary)
Foreign Key is dept_name references Department
Section
(course_id [primary key], sec_id [primary key], semester [primary key], year [primary key], building, room_number, time_slot_id)
Foreign Key course_id references Course
Teaches
(ID [primary key], course_id [primary key], sec_id [primary key], semester [primary key], year [primary key])
Foreign key ID references Instructor,
Foreign Key (course_id,sec_id,semester,year) references Section
Takes
(ID [primary key], course_id [primary key], sec_id [primary key], semester [primary key], year [primary key], grade)
Foreign key(course_id,sec_id,semester,year) references section Foreign key(ID) references student
Student
(ID [primary key], name, dept_name, tot_cred) Foreign key(dept_name) references department
的问题是,我得到尝试使用更新语句(错误是1241 Operand should have 1 column
),纠正我的语法,因为它更可能的问题,当一个错误:
update takes
set ID=ID, course_id='CS-001', sec_id='1', semester='Fall', year=2009, grade=null
where
(
select distinct name, ID
from student natural join takes
where dept_name='Comp. Sci.'
);
对不起,我新的MySQL,如果你可以引导我纠正我的语法,甚至可能比我的解决方案更好(不知道我的解决方案是否是我的解决方案)。
你想更新什么表? –
你得到什么错误?为了将来的参考,如果你发现自己说“我得到一个错误”,请继续并包含错误。 –
我正在尝试更新'take'表 –