Question

拥有像id，parent_id，order_nr

这样的MySQL表格

现在选择这样的一切

SELECT * FROM `table1` WHERE 1 ORDER BY `id` DESC

获得结果

`id`, `parent_id`, `order_nr`
"27",   "23",       "3" 
"26",   "23",       "2" 
"25",   "23",       "1" 
"24",   "0",        "0" 
"23",   "0",        "0" 
"22",   "0",        "0"

需要按照这样的顺序得到相同的结果：

`id`, `parent_id`, `order_nr`
"24",   "0",        "0" 
"23",   "0",        "0" 
"25",   "23",       "3" 
"26",   "23",       "2" 
"27",   "23",       "1"
"22",   "0",        "0"

Answer 1

这个怎么样：

SELECT * FROM `table1` WHERE 1 ORDER BY order_nr,parent_id,id DESC

您可以尝试先交换哪个列。

Answer 2

假设parent_id和order_nr是varchar列，但您想将它们排序为数字，那么您可以在订购时转换列：

SELECT *
FROM table1
ORDER BY CAST(parent_id AS SIGNED),   -- no need for CAST if already numeric
         CAST(order_nr AS SIGNED)

注意：您的第一个所需输出似乎没有任何明显的逻辑，所以我为第二个提供了解决方案。

Answer 3

SELECT * FROM `table1` WHERE 1 ORDER BY `parent_id`, `order_nr` ASC

输出就像：

`id`, `parent_id`, `order_nr`
"24",   "0",        "0" 
"23",   "0",        "0" 
"22",   "0",        "0" 
"25",   "22",       "1" 
"26",   "22",       "2" 
"27",   "22",       "3"

Answer 4

假设id的两位数字（但可以扩展到任意位数）

SELECT IF(parent_id=0,id,parent_id)*100+IF(parent_id=0,0,id)),* FROM table ORDER BY 1 DESC

或者如果ids是字符串

SELECT CONCAT(IF(parent_id='0',LPAD(id,2,'0'),LPAD(parent_id,2,'0')),IF(parent_id='0','00',LPAD(id,2,'0'))),* FROM table ORDER BY 1 DESC

这将为您提供第一列

2400 2300 2227 2226 2225 2200

Answer 5

当parent_id为0时，只需使用id，否则请使用parent_id;按order_nr排序然后打破关系。所有排序都是降序排列：

SELECT id, parent_id, order_nr,
       id AS sort_order
  FROM table1
 WHERE parent_id = '0'
UNION
SELECT id, parent_id, order_nr,
       parent_id AS sort_order
  FROM table1
 WHERE parent_id <> '0'
 ORDER
    BY sort_order DESC, order_nr DESC;

mysql需要获得自定义的结果顺序

5 个答案: