如何从一个表中限制为1的多个表中选择数据

Question

我有多个复选框，用户可以将教育数据添加到数据库。我的结构看起来跟在数据库中：我有三个表，user_education，我保持记录用户选择的教育级别（它可以有多个行为同一个user_id），教育，我存储用户教育描述（只有一行）每user_id），以及我存储所有学位的教育水平。

user_education

id | user_id | education_id
1    83        1
2    83        2

education_description

user_id | description
83        test

education_levels

education_id | education
1              alusharidus
2              keskharidus
3              Bachelor’s degree
4              Master’s degree

等等。我的问题是如何为特定用户选择所有数据，但只显示一次描述？

我试过这个：

select
    user_education.education_id,
    education_levels.education,
    education_description.description
from
    user_education
        join education_description
        left join education_levels
            on user_education.education_id=education_levels.education_id and education_description.user_id = user_education.user_id WHERE user_education.user_id=83;

给了我这个：

这里是多次插入的描述，但我想只有一次。我的结构对于这种类型的逻辑是错误的吗？如果没有，我怎么才选择它一次，所以我可以在提交表格后为用户附加数据？

修改

添加所需的结果

education_description

user_id | education | description
83        test        testing
83        test2
83        test3

Answer 1

请你试试这个答案： -

select
    user_education.education_id,
    GROUP_CONCAT(education_levels.education separator ' ,'),
    education_description.description
from
    user_education
        join education_description
        left join education_levels
            on user_education.education_id=education_levels.education_id and education_description.user_id = user_education.user_id 
WHERE user_education.user_id=83 
GROUP BY user_education.user_id;