從這兩個表中選擇值

Question

我使用mySQL，我試圖找到一個表或另一個表中的行。 下面是表及其字段：

user: id(PK), email, password, is_teacher 

teacher: id, no_teacher(PK), name, id_group, no_class 
teacher_information:no_teacher, cell_phone, SSN, email 

student: id, no_student(PK), name, id_group, no_class 
student_information:cell_phone, email, grade, no_student 

user_role: id, id_role(PK) 

group_leader: id_group, id_role 
group_member: id_group, id_role 

group: id_group(PK), name 

每個用戶（教師或學生）可以在一組組長或成員（不是兩個），並且任何用戶都可以在不同的組。 我想要列出與他的姓名和電子郵件有關的特定組中的每個人。 任何人都可以幫助我得到這個場景的sql查詢嗎？

Answer 1

如果你到teacher_information表和student_id添加一個字段teacher_id到student_information場

SELECT 
    * 
FROM  
    (SELECT 
     t.name as `name`, 
     ti.email as `email`, 
     g.name as `group_name`, 
     g.id_group as `id_group` 
    FROM 
     teacher t, 
     teacher_information ti, 
     group g 
    WHERE 
     t.id = ti.teacher_id and 
     g.id_group = t.id_group 
    UNION 
    SELECT 
     s.name as `name`, 
     si.email as `email`, 
     g.name as `group_name`, 
     g.id_group as `id_group` 
    FROM 
     student s, 
     student_information si, 
     group g 
    WHERE 
     s.id = si.student_id and 
     g.id_group = s.id_group 
    ) as a 
where 
    a.id_group = ? 
;