如何使用空列值对mysql表排序

Question

我有一个具有以下架构的表。 我需要按点对表进行排序，如果存在img_link （不为null ）的行也排在第一位。 只需要做的就是按int列排序，然后按varchar列排序。

+-----+--------+-----------+-----------+
| id  | name   | img_link  |  points   |
+-----+--------+-----------+-----------+
| 11  | smpl   | path.jpg  |  10       |
+-----+--------+-----------+-----------+
| 12  | main   |  null     |  20       |
+-----+--------+-----------+-----------+
| 13  | abcd   |  null     |  10       |
+-----+--------+-----------+-----------+
| 14  | xyls   | img_.png  |  10       |
+-----+--------+-----------+-----------+

需要一个类似的结果

+-----+
| id  |
+-----+
| 12  |
+-----+
| 11  |
+-----+
| 14  |
+-----+
| 13  |
+-----+

提前致谢..

Answer 1

尝试这个

SELECT * FROM table_name ORDER BY points DESC ,ISNULL(img_link), img_link 

Answer 2

基本上，您用言语准确地写下了您需要做的事情。

SELECT id FROM someTable ORDER BY points DESC, img_link DESC;

DEMO

Answer 3

另一种方法是

select *
from table
order by `points` desc,
if(img_link = '' or img_link is null,1,0)

DEMO

Answer 4

尝试这个：

select * from tabalename where img_link is not null order by point desc union select * from tabalename where img_link is null order by point desc

Answer 5

SELECT * FROM my_table ORDER BY points DESC, img_link IS NULL, img_link DESC;