MySQL：多重选择和连接查询

我有以下模式：

Department (dept_id, dept_name)

Student (student_id, student_name, major, level, age)

Professor (prof_id, prof_name, dept_id)

Class (name, meets_at, room, prof_id)

Enrolled (student_id, class_name, semester)

我需要找到注册班级的

SR

级别学生的姓名 由计算机科学系的教授授课

基于我对关系代数的理解，我的尝试是

SELECT s.student_name FROM ( SELECT d.dept_id FROM department as d WHERE d.dept_name = 'computer science' 

                        JOIN professor as p on d.dept_id = p.dept_id

                        JOIN class as c on p.prof_id = c.prof_id 
                        JOIN enrolled as e on c.name = e.class_name
                        JOIN student as s on s.student_id = e.student_id )
                        WHERE s.level = 'sr' ;

但当我尝试它时，我得到了sql语法错误。

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非常感谢您的帮助

选择s.student_name（您必须提到表名），其中s.level='sr'

SELECT s.student_name 
FROM department d
JOIN professor p on d.dept_id = p.dept_id
JOIN class c on p.prof_id = c.prof_id 
JOIN enrolled e on c.name = e.class_name
JOIN student s on s.student_id = e.student_id 
WHERE s.level = 'sr' 
    AND d.dept_name = 'computer science' 

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如果没有表名，它将显示错误。

子查询在MySQL中需要有别名。