Question

我正在尝试像这样进行搜索：

SELECT * FROM questions WHERE id IN (4, 5, 1)

但是，结果按ID排序

+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
| id | question                                                                                   | answer                     | notes | difficulty | toggle |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
|  1 | VAR is much talked about in football - what does VAR stand for?                            | Video Assistant Referee    |       | Medium     |      1 |
|  4 | Which large construction company has gone into receivership with debts of Â£1.5 billion?   | Carillion                  |       | Easy       |      0 |
|  5 | What does PFI stand for in PFI contracts?                                                  | Private Finance Initiative |       | Easy       |      1 |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+

但是，我需要按数组顺序排列的结果。我在以下地方找到了

：

SELECT * FROM questions WHERE id IN (4, 5, 1) ORDER BY FIND_IN_SET(id, '4, 5, 1');

这有点用，但是反向返回：

+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
| id | question                                                                                   | answer                     | notes | difficulty | toggle |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
|  1 | VAR is much talked about in football - what does VAR stand for?                            | Video Assistant Referee    |       | Medium     |      1 |
|  5 | What does PFI stand for in PFI contracts?                                                  | Private Finance Initiative |       | Easy       |      1 |
|  4 | Which large construction company has gone into receivership with debts of Â£1.5 billion?   | Carillion                  |       | Easy       |      0 |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+

然后，建议的解决方案是在末尾添加DESC

SELECT * FROM questions WHERE id IN (4, 5, 1) ORDER BY FIND_IN_SET(id, '4, 5, 1') desc;

返回这个，我根本不知道

+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
| id | question                                                                                   | answer                     | notes | difficulty | toggle |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+
|  4 | Which large construction company has gone into receivership with debts of Â£1.5 billion?   | Carillion                  |       | Easy       |      0 |
|  1 | VAR is much talked about in football - what does VAR stand for?                            | Video Assistant Referee    |       | Medium     |      1 |
|  5 | What does PFI stand for in PFI contracts?                                                  | Private Finance Initiative |       | Easy       |      1 |
+----+--------------------------------------------------------------------------------------------+----------------------------+-------+------------+--------+

为什么是4、1、5而不是4、5、1？如何使其返回4、5、1？

欢呼

Answer 1

您应该使用ORDER BY FIELD()或ORDER BY CASE WHEN...

在您的情况下，第一个可能是最简单的

SELECT * 
FROM questions 
WHERE id IN (4, 5, 1) 
ORDER BY FIELD(id, 4, 5, 1)

SQLfiddle

Answer 2

drop table if exists t;

create table t(id int, question varchar(100));

insert into t values                 
(  1 , 'VAR is much talked about in football - what does VAR stand for?'                            ),
(  4 , 'Which large construction company has gone into receivership with debts of Â£1.5 billion?'   ),
(  5 , 'What does PFI stand for in PFI contracts?'   ); 

select * 
from t
order by case when id = 4 then 1
                  when id = 1 then 2
                  else 3
            end;

+------+------------------------------------------------------------------------------------------+
| id   | question                                                                                 |
+------+------------------------------------------------------------------------------------------+
|    4 | Which large construction company has gone into receivership with debts of Â£1.5 billion? |
|    1 | VAR is much talked about in football - what does VAR stand for?                          |
|    5 | What does PFI stand for in PFI contracts?                                                |
+------+------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)

MySQL-IN（数组）ORDER BY原始

2 个答案: