Question

我有以下表格

用户
问题
QuestionCategories
答案

我很困惑我的用户类是否应该有任何问题或答案的链接

用户将回答表单上显示的问题。

因此，每年对不同的问题都有不同的答案

Answer 1

我假设用户可以提出问题，问题可以属于某个类别，并且许多用户可以发布答案。这实际上就像stackoverflow这样的网站是什么样的。

create table user (
  user_id integer primary key,
  name varchar(40) not null
);

create table category (
  category_id integer primary key,
  category varchar(40) not null
);

create table question (
  question_id integer primary key,
  question text,
  asked_by_id integer not null,
  category_id integer not null,
  foreign key asked_by_id references user(user_id),
  foreign key category_id references categor(category_id)
);

create table answer (
  answers_id     integer not null,
  answered_by_id integer not null,
  answer text,
  primary key (answers_id, answered_by_id), -- we allow one answer per person for a question
  foreign key answers_id references question(question_id),
  foreign key answered_by_id references user(user_id)
);

然后查询：

select qu.name as asked_by,    question, category,
       au.name as answered_by, answer
from user qu                                       -- iterating through users
join question q on qu.user_id    = asked_by_id     -- joining them to their questions
join category c on c.category_id = q.category_id   -- find the category
join answer     on answers_id    = question_id     -- join by what answers this question
join user au    on au.user_id    = answered_by_id; -- looking up the user who answered it

（我没有在服务器上尝试过，所以可能会有拼写错误。请随意纠正。）

Answer 2

嗯，这取决于你想做什么是有道理的。用户是否可以发布问题？如果是，请链接它。如果没有，链接没有意义，因为它会保持空虚。

Answer 3

而不是更新多行，您只需将问题及其选项和答案转换为json并存储为单个字段。

我应该如何在mysql表设计中存储问题和答案

3 个答案: