MySQL如何订购Joined和Group_Concat列？

Question

我有一个名为table_B的表，其示例集如下：

+-serviceID-+-priceID-+-processOrder-+
|    001    |   003   |      03      |
+-----------+---------+--------------+
|    001    |   024   |      02      |        
+-----------+---------+--------------+
|    001    |   001   |      01      |        
+-----------+---------+--------------+

这是我的查询声明：

$query_string = '
  SELECT services.*, GROUP_CONCAT(prices.priceID) AS priceID
  FROM table_A AS services
  INNER JOIN table_B AS prices ON services.serviceID = prices.serviceID
  WHERE services.serviceID = "' . $serviceID . '"
  GROUP BY prices.serviceID
  LIMIT 1
';
$result = mysqli_query($link, $query_string);

$ row ['priceID']的结果是string(11) "001,003,024"

如何根据processOrder列在$ row ['priceID']中订购结果字符串？

我正在尝试将$ row ['priceID']作为string(11) "001,024,003"

返回

Answer 1

查看GROUP_CONCAT syntax：

GROUP_CONCAT([DISTINCT] expr [,expr ...]
         [ORDER BY {unsigned_integer | col_name | expr}
             [ASC | DESC] [,col_name ...]]
         [SEPARATOR str_val])

您可以在括号内设置排序。