如何选择所有相关的行？

Question

我有这样一个表：

// Mytable 
+----+--------------------+---------+ 
| Id | QuestionOrAnswer | related | 
+----+--------------------+---------+ 
| 1 | question1   | 0  | 
| 2 | answer1   | 1  | 
| 3 | answer2   | 1  | 
| 4 | question2   | 0  | 
| 5 | question3   | 0  | 
| 6 | answer4   | 5  | 
| 7 | answer4   | 4  | 
| 8 | answer4   | 5  | 
+----+--------------------+---------+ 

在上表中0手段“问题”和任意数量的其他意味着“答案”。另外，在related列中，每个问题的自身编号都有自己的编号。现在我想知道，我如何选择问题以及所有自己的答案？事情是这样的：

对于问题1：

// Mytable 
+----+--------------------+---------+ 
| Id | QuestionOrAnswer | related | 
+----+--------------------+---------+ 
| 1 | question1   | 0  | 
| 2 | answer1   | 1  | 
| 3 | answer2   | 1  | 
+----+--------------------+---------+ 

对于问题2：

// Mytable 
+----+--------------------+---------+ 
| Id | QuestionOrAnswer | related | 
+----+--------------------+---------+ 
| 4 | question2   | 0  | 
| 7 | answer4   | 4  | 
+----+--------------------+---------+ 

对于问题3：

// Mytable 
+----+--------------------+---------+ 
| Id | QuestionOrAnswer | related | 
+----+--------------------+---------+ 
| 5 | question3   | 0  | 
| 6 | answer4   | 5  | 
| 8 | answer4   | 5  | 
+----+--------------------+---------+ 

等等..我该怎么做？

Answer 1

试试这个：

select * from Mytable where id = 1 or related = 1