mysql嵌套查询获取语法错误

我的问题是：

总分最高的学生注册号

学生注册号是谁 被认为是最坏的科目

存在一个带有属性（注册号、科目、分数）的表“学生”

共有8门课程，每个学生选修全部8门课程。因此，该表由每个学生8条记录组成。学生人数取决于学生人数。例如：10名学生，总记录数=8*10=80

以下是我的疑问。请有人纠正它的错误。谢谢

1)"select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total=(select max(C.total) from (select S1.reg_id,sum(S1.marks) as total from students S1 group by S1.reg_id) as C);"

2)"select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total=(select max(A.total) from A);"`

错误消息：

ERROR 1064 (HY000) at line 1: 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 'select S.reg_id, sum(S.marks) as total from
students S group by
Student's reg_id who took highest total marks : 
 Students' reg_ids who took highest for subject vice : reg_id subject max(s.marks) id1 Buddhist 99 id1 computer 81 id1 English 95 id5 History 82 id1 Literature 95 id1 Maths 97 id1 Sinhala 85 id9 Social 90

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第二，我得到了答案，但没有正确的值。

您的更改如下：

select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total IN (select max(C.total) from (select S1.reg_id,sum(S1.marks) as total from students S1 group by S1.reg_id) as C);

select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total IN (select max(A.total) from A);

你可以试试这个

      Select reg_id, max (total) as maxtotal from (
        select reg_id, sum(marks) as total from students S    group by reg_id ) t

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请在第1行发布errormessageERROR 1064（HY000）：您的SQL语法有错误。查看与您的MySQL服务器版本对应的手册，了解使用near“按总分最高的学生注册id从学生组中选择S.reg\U id，sum（S.marks）作为总计”的正确语法：科目vice：reg\U id

科目max（S.marks）id1佛教徒99 id1计算机81 id1英语95 id5历史82 id1文学95 id1数学97 id1僧伽罗85 id9社会90第二个，我得到了答案，但值错误：（在第一个查询中，我想你必须有一个
（
更多之前
）（选择S.reg_id，
嵌套查询非常复杂