使用NOT in运算符在MySql中选择的问题？

我使用以下mysql查询选择了所有选择的信息，其中student表的student id在CostShared表中不存在，但我遇到了一个错误

有什么帮助吗？提前谢谢

select st.id as 'Student ID', st.stud_fname as 'First Name', st.stud_lname as 'Last Name', st.stud_middle_name as 'Middle Name',
 dp.dep_name as 'Department',dp.max_dur_year as 'Max Duration', st.entry_year as 'Entry',MAX(sc.acc_year) as 'Current Academic Year',  
 sum(sc.Tuition_fee+sc.Accomod_fee+sc.Food_fee) as 'Total Cost Sharing'

from student st left JOIN student_costsharing sc on st.id = sc.stud_id
left join department dp on st.dep_id=dp.id 

 where st.id not in ( SELECT *              
        FROM student_costsharing 
        WHERE sc.stud_id=st.id
               )

GROUP BY st.stud_fname
order by st.stud_fname

错误消息：

1241-操作数应包含1列

---

您需要在子句的

中指定列，而不是使用
*

 where st.id not in ( SELECT stud_id              
        FROM student_costsharing 
        WHERE sc.stud_id=st.id
               )

您需要在

子句的

中指定列，而不是使用
*

 where st.id not in ( SELECT stud_id              
        FROM student_costsharing 
        WHERE sc.stud_id=st.id
               )

试试这些，我已经更改了WHERE NOT IN语句：-

select st.id as 'Student ID', st.stud_fname as 'First Name', st.stud_lname as 'Last Name', st.stud_middle_name as 'Middle Name',
 dp.dep_name as 'Department',dp.max_dur_year as 'Max Duration', st.entry_year as 'Entry',MAX(sc.acc_year) as 'Current Academic Year',  
 sum(sc.Tuition_fee+sc.Accomod_fee+sc.Food_fee) as 'Total Cost Sharing'

from student st left JOIN student_costsharing sc on st.id = sc.stud_id
left join department dp on st.dep_id=dp.id 

 where st.id not in ( SELECT stud_id              
        FROM student_costsharing 
        WHERE sc.stud_id=st.id
               )

GROUP BY st.stud_fname
order by st.stud_fname

试试这些，我已经更改了WHERE NOT IN语句：-

select st.id as 'Student ID', st.stud_fname as 'First Name', st.stud_lname as 'Last Name', st.stud_middle_name as 'Middle Name',
 dp.dep_name as 'Department',dp.max_dur_year as 'Max Duration', st.entry_year as 'Entry',MAX(sc.acc_year) as 'Current Academic Year',  
 sum(sc.Tuition_fee+sc.Accomod_fee+sc.Food_fee) as 'Total Cost Sharing'

from student st left JOIN student_costsharing sc on st.id = sc.stud_id
left join department dp on st.dep_id=dp.id 

 where st.id not in ( SELECT stud_id              
        FROM student_costsharing 
        WHERE sc.stud_id=st.id
               )

GROUP BY st.stud_fname
order by st.stud_fname

问题是，子查询的结果集应该只包含一列，因为不能将where子句的操作数与表的整个结果集进行比较。
应该将哪个列与id进行比较

要解决此问题，您需要选择表中要与值进行比较的一列。
问题是，子查询的结果集应仅包含一列，因为您无法将where子句的操作数与表的整个结果集进行比较。
应该将哪个列与id进行比较

为了解决这个问题,，您需要选择表中要与您的值进行比较的一列。
将select*更改为clouse中的id…对您有效吗？如果有效，请接受我的答案…将select*更改为clouse中的id…对您有效吗？如果有效，请接受我的答案…非常有用的想法。谢谢。这个主意很有用。谢谢。我接受了，然后投票支持我。我接受了，然后投票支持我。